This document discusses turbomachinery and hydraulic turbines. It begins by defining turbomachinery as rotating machines that add or extract energy from fluid. It then describes the basic types of hydraulic machines - displacement and rotodynamic. Rotodynamic machines include turbines and pumps, which have rotating elements that fluid passes through. Key hydraulic turbines discussed include impulse (Pelton) and reaction (Francis, Kaplan) turbines. The document provides detailed descriptions of how Pelton wheels in particular work as high-head impulse turbines that convert hydraulic energy to mechanical energy via rotating buckets impacted by high-velocity water jets. It also outlines the basic energy transfer equation for rotodynamic machines.
This document provides an overview of the Pelton turbine. It describes the Pelton turbine as an impulse type water turbine invented by Lester Allan Pelton in the 1870s. The key parts of a Pelton turbine discussed include the penstock, runner, casing, spear rod, deflector, nozzle, and brake nozzle. It also briefly discusses the specific speed of turbines and notes that China produces the most hydroelectric power worldwide.
This presentation discusses reaction turbines. It defines a reaction turbine as a type of turbine that develops torque by reacting to the pressure or weight of a fluid based on Newton's third law of motion. The document outlines the working principle of reaction turbines and describes the main types - radial flow, axial flow, and mixed flow turbines. Examples of specific reaction turbines are provided, including the Francis, Kaplan, and propeller turbines. The advantages and disadvantages of reaction turbines are summarized. Key concepts like pressure compounding, turbine blade stages, and the pressure-velocity diagram for reaction blades are also explained briefly.
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1. The document discusses various topics related to hydraulic turbines including their classification, selection, design principles of Pelton, Francis and Kaplan turbines, draft tubes, surge tanks, governing, unit quantities, characteristic curves, similitude analysis and cavitation.
2. Hydraulic turbines are classified based on the type of energy at the inlet, direction of flow through the runner, head at the inlet, and specific speed. Pelton wheels are impulse turbines suitable for high heads while Francis and Kaplan turbines are reaction turbines for lower heads.
3. The design of each turbine type involves guidelines related to jet ratio, speed ratio, velocities, discharge, power and efficiency calculations. Characteristic curves show the performance of a
The document discusses specific speed, which is a metric used to compare different types of turbines. Specific speed is defined as the speed of a geometrically similar turbine that produces 1 unit of power under 1 unit of head. The specific speed ranges are provided for common turbine types: Pelton wheel turbines have a specific speed of 80-50, Francis turbines range from 50-250, and Kaplan turbines have the highest specific speed range of 250-850. Specific speed is one factor used to select the appropriate turbine type for installation based on factors like head, part load operations, number of units, cost, and more. Turbines are also classified as having high, medium, or low specific speeds based on these defined ranges.
The Francis turbine is an inward flow reaction turbine with radial discharge at the outlet. It is a mixed-flow turbine where water enters the runner radially and exits axially. Francis turbines are used in applications with medium head between 45-250 meters. They have medium specific speeds between 50-250 and a vertically oriented shaft. Francis turbines are widely used worldwide due to their high efficiencies between 80-94%. However, they also have high costs due to their complex design and cavitation can be an issue.
This document discusses the law of gearing in three main points:
1) The common normal at the point of contact between gear teeth must always pass through the pitch point. This is the fundamental condition for designing gear teeth profiles.
2) The angular velocity ratio between two gears must remain constant throughout meshing.
3) The angular velocity ratio is inversely proportional to the ratio of the distances of the pitch point P from the gear centers O1 and O2. The common normal intersecting the line of centers at P divides the center distance inversely proportional to the angular velocity ratio.
This document provides an overview of the Pelton turbine. It describes the Pelton turbine as an impulse type water turbine invented by Lester Allan Pelton in the 1870s. The key parts of a Pelton turbine discussed include the penstock, runner, casing, spear rod, deflector, nozzle, and brake nozzle. It also briefly discusses the specific speed of turbines and notes that China produces the most hydroelectric power worldwide.
This presentation discusses reaction turbines. It defines a reaction turbine as a type of turbine that develops torque by reacting to the pressure or weight of a fluid based on Newton's third law of motion. The document outlines the working principle of reaction turbines and describes the main types - radial flow, axial flow, and mixed flow turbines. Examples of specific reaction turbines are provided, including the Francis, Kaplan, and propeller turbines. The advantages and disadvantages of reaction turbines are summarized. Key concepts like pressure compounding, turbine blade stages, and the pressure-velocity diagram for reaction blades are also explained briefly.
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1. The document discusses various topics related to hydraulic turbines including their classification, selection, design principles of Pelton, Francis and Kaplan turbines, draft tubes, surge tanks, governing, unit quantities, characteristic curves, similitude analysis and cavitation.
2. Hydraulic turbines are classified based on the type of energy at the inlet, direction of flow through the runner, head at the inlet, and specific speed. Pelton wheels are impulse turbines suitable for high heads while Francis and Kaplan turbines are reaction turbines for lower heads.
3. The design of each turbine type involves guidelines related to jet ratio, speed ratio, velocities, discharge, power and efficiency calculations. Characteristic curves show the performance of a
The document discusses specific speed, which is a metric used to compare different types of turbines. Specific speed is defined as the speed of a geometrically similar turbine that produces 1 unit of power under 1 unit of head. The specific speed ranges are provided for common turbine types: Pelton wheel turbines have a specific speed of 80-50, Francis turbines range from 50-250, and Kaplan turbines have the highest specific speed range of 250-850. Specific speed is one factor used to select the appropriate turbine type for installation based on factors like head, part load operations, number of units, cost, and more. Turbines are also classified as having high, medium, or low specific speeds based on these defined ranges.
The Francis turbine is an inward flow reaction turbine with radial discharge at the outlet. It is a mixed-flow turbine where water enters the runner radially and exits axially. Francis turbines are used in applications with medium head between 45-250 meters. They have medium specific speeds between 50-250 and a vertically oriented shaft. Francis turbines are widely used worldwide due to their high efficiencies between 80-94%. However, they also have high costs due to their complex design and cavitation can be an issue.
This document discusses the law of gearing in three main points:
1) The common normal at the point of contact between gear teeth must always pass through the pitch point. This is the fundamental condition for designing gear teeth profiles.
2) The angular velocity ratio between two gears must remain constant throughout meshing.
3) The angular velocity ratio is inversely proportional to the ratio of the distances of the pitch point P from the gear centers O1 and O2. The common normal intersecting the line of centers at P divides the center distance inversely proportional to the angular velocity ratio.
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The document provides lecture notes on steam nozzles and power plants. It discusses:
1) The basic components and energy conversion process in thermal power plants, including the Rankine cycle in which water is heated to steam to power a turbine and generator.
2) The history and development of steam turbines, from early aeolipile devices to modern turbines invented by Charles Parsons in 1884.
3) How energy is converted in steam turbines via nozzles that accelerate steam to high velocity to impulse turbine blades and produce rotation.
4) Details on nozzle types, flow properties, relationships between area, velocity and pressure, and equations for calculating velocity from enthalpy change.
A turbine is a rotary mechanical device that extracts energy from a fast moving flow of water, steam, gas, air, or other fluid and converts it into useful work. Also a turbine is a turbo-machine with at least one moving part called a rotor assembly, which is a shaft or drum with blades attached. Moving fluid acts on the blades so that they move and impart rotational energy to the rotor. According to the fluid used:
• Water Turbine
• Steam Turbine
• Gas Turbine
• Wind Turbine
Although the same principles apply to all turbines, their specific designs differ sufficiently to merit separate descriptions.
Working Principle Water Turbine
• When the fluid strikes the blades of the turbine, the blades are displaced, which produces rotational energy.
• When the turbine shaft is directly coupled to an electric generator mechanical energy is converted into electrical energy.
• This electrical power is known as hydroelectric power.
In a hydraulic turbine, water is used as the source of energy. Water or hydraulic turbines convert kinetic and potential energies of the water into mechanical power. Water turbines are mostly found in dams to generate electric power from water kinetic energy.
Classification
Based on hydraulic action of water
Based on direction of flow
Based on head of water and quantity of flow
Based on specific speed
Based on disposition of turbine shaft
Based on name of originator (commonly used turbines)
This document discusses different types of turbines, focusing on Francis turbines. It describes how Francis turbines work by using both kinetic and pressure energy of flowing water. Sir James Francis invented the Francis turbine in Lowell, Massachusetts in the 1840s by redesigning an earlier Boyden turbine to significantly increase efficiency from 65% to 88%. Francis turbines are now the most commonly used water turbine for power generation, with efficiencies between 80-94%. They can operate in heads from 10-650 meters and generate 10-750 megawatts typically. The key components of a Francis turbine installation and its working mechanism are explained.
Velocity Triangle for Moving Blade of an impulse TurbineShowhanur Rahman
Impulse turbines use steam jets to transfer momentum to rotating blades, while reaction turbines use the pressure of steam flowing over stationary and moving blades to rotate the shaft. Both use velocity triangles to analyze steam flow at the inlet and outlet of curved blades. The power produced depends on the change in steam whirl velocity as it flows through the blades. Reaction turbines experience axial thrust from the change in steam flow velocity from inlet to outlet.
The document provides an introduction to turbomachinery. It discusses the working principle of turbomachines, which involves the transfer of energy between a rotating element and fluid flow using Newton's second law of motion. Turbomachines are classified based on the direction of work (done by or on the fluid) and the fluid flow direction (axial, radial, or mixed). Common applications of turbomachines include centrifugal pumps, compressors, and fans in industries; axial compressors and gas turbines in aircraft; steam and hydraulic turbines; wind turbines; and turbochargers in automobiles.
1) The document discusses the impact of a jet of water on stationary and moving plates. It defines impact of jet as the force exerted by the jet on a plate.
2) Key factors that determine the force include the jet velocity, plate velocity, plate angle, and whether the plate is flat, curved, or includes a series of vanes.
3) Formulas are provided to calculate the force and work done on plates in different configurations based on impulse-momentum principles.
This document provides an overview of centrifugal pumps. It defines a pump and discusses the main components and classifications of centrifugal pumps. The key components of a centrifugal pump are the impeller, casing, suction pipe, and delivery pipe. Centrifugal pumps are classified based on impeller design and casing shape. The document also covers topics such as work done by the centrifugal pump, head of a pump, losses and efficiencies, and minimum speed for starting a centrifugal pump. Several example problems are provided to calculate values like inlet vane angle, work done, and minimum starting speed.
An air vessel is fitted to reciprocating pumps to provide continuous and uniform fluid flow. It contains compressed air above liquid and has an opening where liquid can flow in and out. This allows the pump to run at high speeds without separation. The document also describes equations to calculate head loss due to friction in suction and delivery pipes at different points in the stroke, as well as equations for pressure head in the cylinder.
Turbines work by converting the kinetic energy of a moving fluid like water, steam, gas or wind into mechanical rotational energy. There are different types of turbines that are designed based on how the fluid interacts with the turbine blades including impulse turbines where the fluid hits the blades at high speed, and reaction turbines where the pressure of the fluid changes as it passes through the rotor blades. Common types of turbines include water turbines like the Pelton, Francis and Kaplan turbines, steam turbines used in power plants, gas turbines that power aircraft and generators, and wind turbines that convert wind energy into electricity.
The document summarizes key aspects of steam turbines. It begins by explaining that a steam turbine converts the heat energy of steam into kinetic energy and then rotational energy to generate power. It then describes the basic Rankine cycle used in steam turbine power plants.
The main body explains the principles of operation for impulse and reaction turbines. In an impulse turbine, steam expands within nozzles and does not change pressure as it moves over blades, while in a reaction turbine steam pressure gradually drops as it expands over fixed and moving blades.
Finally, it discusses methods to improve efficiency, such as compounding and reheat, where dividing the expansion process into multiple stages separated by reheaters increases overall efficiency compared to a single stage by
This document provides information about steam nozzles and steam turbines. It discusses:
1. Steam nozzles convert the heat energy of steam into kinetic energy by accelerating steam through a passage of varying cross-section.
2. Steam turbines convert the high-pressure, high-temperature steam from a steam generator into rotational shaft work.
3. There are three main types of nozzles used in steam turbines: convergent, divergent, and convergent-divergent. Convergent-divergent nozzles are widely used today.
4. The document then discusses concepts like Mach number and critical pressure that are important for steam nozzle and turbine operation.
This document discusses turbomachines and provides classifications. It begins by defining turbomachines as machines that transfer energy between a rotor and fluid, including both turbines and compressors. Turbines transfer energy from fluid to rotor, while compressors transfer from rotor to fluid. Turbomachines are then classified based on: whether they transfer energy from fluid to rotor (turbine) or rotor to fluid (pump); number of stages (single or multi-stage); extent of fluid (infinite or finite); type of fluid (thermal, gas, hydro); flow type (axial, mixed, or radial); purpose (power producing or absorbing); and design (open or closed). Comparisons are made between turbomachines and positive
The Francis turbine is a mixed-flow reaction turbine that was developed by James B. Francis in 1849. It operates in a water head from 60 to 250 meters. Water enters the runner radially at the outer periphery and exits axially at the center. It uses both the kinetic and pressure energy of water to drive the turbine. Key components include a spiral casing, stay vanes, guide vanes, runner blades, and a draft tube. The guide vanes direct water onto the runner blades to efficiently convert the hydraulic energy of water into mechanical rotation of the shaft and electrical energy via a generator. The speed of the turbine is maintained constant via a governing mechanism that controls the guide vanes.
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Turbines extract energy from moving fluids and convert it to rotational energy. The main types are water, steam, gas, and wind turbines. Water turbines include impulse turbines like Pelton and cross-flow, which use jet velocity, and reaction turbines like Francis and Kaplan, which use changing fluid pressure. Steam turbines convert thermal energy from pressurized steam. Gas turbines power aircraft and generators using combustion. Wind turbines have rotors to capture kinetic wind energy and generators to produce electricity. Turbines are used widely in power generation and industrial applications.
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Turbomachines are devices that transfer energy between a rotating element and a fluid due to dynamic action, resulting in changes to the fluid's pressure and momentum. Turbomachines have various applications including fluid transfer, electrical power generation, and aircraft propulsion. They can be classified based on the direction of energy transfer, flow direction, fluid condition, and position of the rotating shaft. Principal components include a rotating element, stator, input/output shafts, and a housing. Modern turbomachines can generate over 250 MW of power and accommodate high pressures and temperatures.
This document discusses methods to improve the efficiency of steam turbines, including reheating steam, regenerative feed heating, and binary vapor plants. Reheating steam involves removing steam from the turbine when it becomes wet, reheating it to a superheated state, and returning it to the next turbine stage. This increases work output, efficiency, and reduces blade erosion and water consumption. Regenerative feed heating involves using steam bled from the turbine to preheat feedwater entering the boiler, improving efficiency. Binary vapor plants use a lower boiling point fluid like mercury as the working fluid, allowing higher turbine inlet temperatures and thus greater efficiencies than steam turbines alone.
This document provides information on several types of hydro turbines, including the Pelton wheel, Francis, and Kaplan turbines. It describes the key components and working principles of each turbine type. The Pelton wheel is an impulse turbine used for high heads, while the Francis and Kaplan are reaction turbines that can be used for a wide range of heads. The Francis turbine is the most commonly used design, making up about 60% of global hydropower capacity.
Watch Video of this presentation on Link: https://youtu.be/g8eJsznmsaY
For notes/articles, Visit my blog (link is given below).
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The document provides lecture notes on steam nozzles and power plants. It discusses:
1) The basic components and energy conversion process in thermal power plants, including the Rankine cycle in which water is heated to steam to power a turbine and generator.
2) The history and development of steam turbines, from early aeolipile devices to modern turbines invented by Charles Parsons in 1884.
3) How energy is converted in steam turbines via nozzles that accelerate steam to high velocity to impulse turbine blades and produce rotation.
4) Details on nozzle types, flow properties, relationships between area, velocity and pressure, and equations for calculating velocity from enthalpy change.
A turbine is a rotary mechanical device that extracts energy from a fast moving flow of water, steam, gas, air, or other fluid and converts it into useful work. Also a turbine is a turbo-machine with at least one moving part called a rotor assembly, which is a shaft or drum with blades attached. Moving fluid acts on the blades so that they move and impart rotational energy to the rotor. According to the fluid used:
• Water Turbine
• Steam Turbine
• Gas Turbine
• Wind Turbine
Although the same principles apply to all turbines, their specific designs differ sufficiently to merit separate descriptions.
Working Principle Water Turbine
• When the fluid strikes the blades of the turbine, the blades are displaced, which produces rotational energy.
• When the turbine shaft is directly coupled to an electric generator mechanical energy is converted into electrical energy.
• This electrical power is known as hydroelectric power.
In a hydraulic turbine, water is used as the source of energy. Water or hydraulic turbines convert kinetic and potential energies of the water into mechanical power. Water turbines are mostly found in dams to generate electric power from water kinetic energy.
Classification
Based on hydraulic action of water
Based on direction of flow
Based on head of water and quantity of flow
Based on specific speed
Based on disposition of turbine shaft
Based on name of originator (commonly used turbines)
This document discusses different types of turbines, focusing on Francis turbines. It describes how Francis turbines work by using both kinetic and pressure energy of flowing water. Sir James Francis invented the Francis turbine in Lowell, Massachusetts in the 1840s by redesigning an earlier Boyden turbine to significantly increase efficiency from 65% to 88%. Francis turbines are now the most commonly used water turbine for power generation, with efficiencies between 80-94%. They can operate in heads from 10-650 meters and generate 10-750 megawatts typically. The key components of a Francis turbine installation and its working mechanism are explained.
Velocity Triangle for Moving Blade of an impulse TurbineShowhanur Rahman
Impulse turbines use steam jets to transfer momentum to rotating blades, while reaction turbines use the pressure of steam flowing over stationary and moving blades to rotate the shaft. Both use velocity triangles to analyze steam flow at the inlet and outlet of curved blades. The power produced depends on the change in steam whirl velocity as it flows through the blades. Reaction turbines experience axial thrust from the change in steam flow velocity from inlet to outlet.
The document provides an introduction to turbomachinery. It discusses the working principle of turbomachines, which involves the transfer of energy between a rotating element and fluid flow using Newton's second law of motion. Turbomachines are classified based on the direction of work (done by or on the fluid) and the fluid flow direction (axial, radial, or mixed). Common applications of turbomachines include centrifugal pumps, compressors, and fans in industries; axial compressors and gas turbines in aircraft; steam and hydraulic turbines; wind turbines; and turbochargers in automobiles.
1) The document discusses the impact of a jet of water on stationary and moving plates. It defines impact of jet as the force exerted by the jet on a plate.
2) Key factors that determine the force include the jet velocity, plate velocity, plate angle, and whether the plate is flat, curved, or includes a series of vanes.
3) Formulas are provided to calculate the force and work done on plates in different configurations based on impulse-momentum principles.
This document provides an overview of centrifugal pumps. It defines a pump and discusses the main components and classifications of centrifugal pumps. The key components of a centrifugal pump are the impeller, casing, suction pipe, and delivery pipe. Centrifugal pumps are classified based on impeller design and casing shape. The document also covers topics such as work done by the centrifugal pump, head of a pump, losses and efficiencies, and minimum speed for starting a centrifugal pump. Several example problems are provided to calculate values like inlet vane angle, work done, and minimum starting speed.
An air vessel is fitted to reciprocating pumps to provide continuous and uniform fluid flow. It contains compressed air above liquid and has an opening where liquid can flow in and out. This allows the pump to run at high speeds without separation. The document also describes equations to calculate head loss due to friction in suction and delivery pipes at different points in the stroke, as well as equations for pressure head in the cylinder.
Turbines work by converting the kinetic energy of a moving fluid like water, steam, gas or wind into mechanical rotational energy. There are different types of turbines that are designed based on how the fluid interacts with the turbine blades including impulse turbines where the fluid hits the blades at high speed, and reaction turbines where the pressure of the fluid changes as it passes through the rotor blades. Common types of turbines include water turbines like the Pelton, Francis and Kaplan turbines, steam turbines used in power plants, gas turbines that power aircraft and generators, and wind turbines that convert wind energy into electricity.
The document summarizes key aspects of steam turbines. It begins by explaining that a steam turbine converts the heat energy of steam into kinetic energy and then rotational energy to generate power. It then describes the basic Rankine cycle used in steam turbine power plants.
The main body explains the principles of operation for impulse and reaction turbines. In an impulse turbine, steam expands within nozzles and does not change pressure as it moves over blades, while in a reaction turbine steam pressure gradually drops as it expands over fixed and moving blades.
Finally, it discusses methods to improve efficiency, such as compounding and reheat, where dividing the expansion process into multiple stages separated by reheaters increases overall efficiency compared to a single stage by
This document provides information about steam nozzles and steam turbines. It discusses:
1. Steam nozzles convert the heat energy of steam into kinetic energy by accelerating steam through a passage of varying cross-section.
2. Steam turbines convert the high-pressure, high-temperature steam from a steam generator into rotational shaft work.
3. There are three main types of nozzles used in steam turbines: convergent, divergent, and convergent-divergent. Convergent-divergent nozzles are widely used today.
4. The document then discusses concepts like Mach number and critical pressure that are important for steam nozzle and turbine operation.
This document discusses turbomachines and provides classifications. It begins by defining turbomachines as machines that transfer energy between a rotor and fluid, including both turbines and compressors. Turbines transfer energy from fluid to rotor, while compressors transfer from rotor to fluid. Turbomachines are then classified based on: whether they transfer energy from fluid to rotor (turbine) or rotor to fluid (pump); number of stages (single or multi-stage); extent of fluid (infinite or finite); type of fluid (thermal, gas, hydro); flow type (axial, mixed, or radial); purpose (power producing or absorbing); and design (open or closed). Comparisons are made between turbomachines and positive
The Francis turbine is a mixed-flow reaction turbine that was developed by James B. Francis in 1849. It operates in a water head from 60 to 250 meters. Water enters the runner radially at the outer periphery and exits axially at the center. It uses both the kinetic and pressure energy of water to drive the turbine. Key components include a spiral casing, stay vanes, guide vanes, runner blades, and a draft tube. The guide vanes direct water onto the runner blades to efficiently convert the hydraulic energy of water into mechanical rotation of the shaft and electrical energy via a generator. The speed of the turbine is maintained constant via a governing mechanism that controls the guide vanes.
Watch Video of this presentation on Link: https://youtu.be/nt9-q5SDaqk
For notes/articles, Visit my blog (link is given below).
For Video, Visit our YouTube Channel (link is given below).
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Turbines extract energy from moving fluids and convert it to rotational energy. The main types are water, steam, gas, and wind turbines. Water turbines include impulse turbines like Pelton and cross-flow, which use jet velocity, and reaction turbines like Francis and Kaplan, which use changing fluid pressure. Steam turbines convert thermal energy from pressurized steam. Gas turbines power aircraft and generators using combustion. Wind turbines have rotors to capture kinetic wind energy and generators to produce electricity. Turbines are used widely in power generation and industrial applications.
Watch Video of this presentation on Link: https://youtu.be/xIGlZ3UvLdw
For notes/articles, Visit my blog (link is given below).
For Video, Visit our YouTube Channel (link is given below).
Any Suggestions/doubts/reactions, please leave in the comment box.
Follow Us on
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Turbomachines are devices that transfer energy between a rotating element and a fluid due to dynamic action, resulting in changes to the fluid's pressure and momentum. Turbomachines have various applications including fluid transfer, electrical power generation, and aircraft propulsion. They can be classified based on the direction of energy transfer, flow direction, fluid condition, and position of the rotating shaft. Principal components include a rotating element, stator, input/output shafts, and a housing. Modern turbomachines can generate over 250 MW of power and accommodate high pressures and temperatures.
This document discusses methods to improve the efficiency of steam turbines, including reheating steam, regenerative feed heating, and binary vapor plants. Reheating steam involves removing steam from the turbine when it becomes wet, reheating it to a superheated state, and returning it to the next turbine stage. This increases work output, efficiency, and reduces blade erosion and water consumption. Regenerative feed heating involves using steam bled from the turbine to preheat feedwater entering the boiler, improving efficiency. Binary vapor plants use a lower boiling point fluid like mercury as the working fluid, allowing higher turbine inlet temperatures and thus greater efficiencies than steam turbines alone.
This document provides information on several types of hydro turbines, including the Pelton wheel, Francis, and Kaplan turbines. It describes the key components and working principles of each turbine type. The Pelton wheel is an impulse turbine used for high heads, while the Francis and Kaplan are reaction turbines that can be used for a wide range of heads. The Francis turbine is the most commonly used design, making up about 60% of global hydropower capacity.
This document provides information about a group project to design an impulse turbine. The group leader is Abdul Jabbar and the other 7 group members are listed. It then provides details about turbines in general and impulse turbines specifically. It discusses the classification, working principle, parts, and efficiency of impulse turbines. It also compares impulse turbines to reaction turbines and lists the advantages and disadvantages of impulse turbines.
Applications of turbines-Hydroelectric Power PlantsAnand Prithviraj
Different types of turbines used in hydroelectric power plants based on the working parameters such as head, flow, etc., Characteristics of a turbine; specific to its applications in a dam.
This document provides information on hydraulic turbines, including their definition, history, parts, types, and classifications. It focuses on the Pelton turbine, describing its working principle and key design aspects. The Pelton turbine uses the kinetic energy of water directed through a nozzle to spin buckets on a wheel. It is well-suited for high heads. Design considerations for the Pelton wheel include the velocity of its jet and buckets, the jet deflection angle, wheel and jet diameters, bucket dimensions, and the number of jets and buckets.
Turbines convert hydraulic energy from flowing water into mechanical energy via a shaft. Francis turbines, invented in 1848, are a common type of inward reaction turbine that convert both kinetic and pressure energy. They have main components like a spiral casing, guide vanes, runner, and draft tube. Pelton wheels are impulse turbines that use nozzles to convert water's pressure energy into kinetic energy before it strikes buckets on the runner to rotate it. They are suitable for high head applications.
Hydraulic turbines can be classified in several ways:
1) Based on flow path - axial flow, radial flow, or mixed flow turbines depending on whether water flows parallel, perpendicular, or with components of both to the axis of rotation.
2) Based on pressure change - impulse turbines where pressure doesn't change through the rotor, and reaction turbines where pressure changes through the rotor.
3) Based on head and specific speed - high, medium, low head turbines and low, medium, high specific speed turbines.
The document then provides details on the classification, parts, and working of Pelton and Francis turbines as examples of impulse and reaction turbines.
This document describes the impulse turbine known as the Pelton turbine. It consists of a wheel with buckets that is struck by one or more high-velocity jets of water. The jet is produced by a nozzle that converts the potential energy of water from a reservoir into kinetic energy. As the jet strikes the buckets, it transfers momentum which spins the wheel and powers the turbine's shaft. Key components include the runner, buckets, nozzle, and casing. The document provides details on dimensions, speed ratio, jet ratio, and the number of jets used.
This document describes a group project on the Francis turbine. It provides details on the group members, introduction to turbines, basic turbine types, the history and inventor of the Francis turbine, its key components and working, efficiency, advantages, applications, and recent advancements. The Francis turbine is the most commonly used water turbine today for power generation due to its ability to effectively use both water pressure and velocity through a mixed-flow design.
The document discusses different types of turbines that convert various forms of energy into rotational energy. It describes turbines that use steam, water, and gas as the working fluid. Specific types covered include Pelton, Francis, and Kaplan turbines. The Pelton turbine uses high-pressure jets of water to drive buckets on a wheel and is best for high heads. Francis turbines are inward-flow reaction turbines suitable for lower heads and higher flows. Kaplan turbines have adjustable blades and are used for low heads. Hydraulic turbines are further classified by head, flow rate, specific speed, and direction of flow through the runner.
This document provides information on governing hydraulic turbines. It discusses the construction details of a Pelton turbine, including its nozzle, spear, runner with buckets, casing, and breaking jet. It also discusses specifications of Pelton turbines such as being a tangential flow turbine with high head. Two types of governing mechanisms for impulse turbines are described: needle wheel rod mechanism and deflector pin mechanism and wheel rod mechanism. The document also discusses the main parts of a Francis turbine, including its spiral casing, guide vanes, runner blades, and draft tube. It notes Francis turbines are medium head with medium specific speed and discharge.
Jet propulsion means the propulsion or movement of the bodies such as ships, aircrafts, rocket etc. with the help of jet.
It is well known from Newton’s Law that to change momentum of fluid, a force is required. Similarly, when momentum of fluid is changed, a force is generated. This principle is made use in hydraulic turbine.
The document discusses hydroelectric power plants and their components. It provides definitions and descriptions of key parts of hydropower plants including the forebay, intake structure, penstock, surge chamber, hydraulic turbines, power house, draft tube, and tailrace. It also discusses different types of turbines used in hydropower generation such as Pelton wheels, Francis turbines, and Kaplan turbines. Classification of hydropower plants by installed capacity into large, medium, small, mini, and micro categories is also mentioned.
This document discusses hydraulic machines and turbines. It begins by defining hydraulic machines as machines that convert hydraulic energy (water energy) to mechanical energy or vice versa. Turbines are hydraulic machines that convert hydraulic energy to mechanical energy. Common types of turbines discussed include impulse turbines like the Pelton turbine and reaction turbines like the Francis turbine and Kaplan turbine. The document then provides details on the workings, components, applications and efficiencies of these various turbine types.
This document provides an overview of hydraulic machines and turbines. It defines hydraulic machines as machines that convert hydraulic energy (water energy) to mechanical energy or vice versa. Turbines are hydraulic machines that convert hydraulic energy to mechanical energy, while pumps convert mechanical energy to hydraulic energy. The document then discusses various types of turbines in more detail, including impulse turbines like the Pelton turbine and reaction turbines like the Francis turbine and Kaplan turbine. It covers the basic workings, components, applications and efficiencies of these different turbine types. Finally, it introduces the concept of performance characteristic curves for turbines.
Francis and Kaplan turbines are reaction turbines that convert the kinetic and pressure energy of water into rotational energy. The Francis turbine has inward radial flow and is used for medium heads from 45-400m. It has a spiral casing, guide vanes, radial runner blades, and a draft tube. The Kaplan turbine is an evolution of the Francis with axial parallel flow and adjustable blades for low heads from 2-40m. Both turbines use velocity triangles to analyze the water flow through the components.
The document discusses rotameters and centrifugal pumps. It provides details on the construction and working principles of rotameters, which measure flow rate by using a float that rises and falls in a tapered tube to vary the flow area. The position of the float corresponds to the flow rate. Centrifugal pumps are also covered, explaining that they use centrifugal force to increase a liquid's kinetic energy and convert it to pressure energy to lift and discharge the liquid. Key components of centrifugal pumps include an impeller and casing.
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Hydraulic turbines and pumps use the energy of moving water to generate power or move fluids. Turbines transform the kinetic energy of falling water into rotational mechanical energy, often used to drive electric generators. Pumps use mechanical energy to move fluids from one place to another and increase their pressure. There are several types of turbines and pumps classified by their design and water flow characteristics. Common turbine types include Pelton, Francis and Kaplan turbines which are used in high, medium and low head applications. Common pumps include reciprocating pumps which use pistons and centrifugal pumps which use a rotating impeller to accelerate water outwards.
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2. • Rotating machine that adds or extracts energy from a
fluid by virtue of a rotating system of blades
• Hydraulic machines can be divided into displacement
machines and rotodynamic machines
• In displacement machines the volume of a chamber is
increased/decreased by forcing a fluid into and out of the
chamber. e.g. tyre pump, human heart etc.
3. • Rotodynamic machines have a set of blades, buckets,
flow channels/ passages forming a rotor. Its rotation
produces dynamic effects to extract/add energy from/to a
fluid.
• Includes turbines and pumps
• Have rotating element through which the fluid passes
• The rotor is called a runner in turbine and an impeller in
the pump.
4. • Turbine is a device that extracts energy from a fluid
(converts the energy held by the fluid to mechanical
energy)
• Pumps are devices that add energy to the fluid (e.g.
pumps, fans, blowers and compressors).
5. Turbines
• Hydro electric power is the most remarkable
development pertaining to the exploitation of
water resources throughout the world
• Hydroelectric power is developed by hydraulic
turbines which are hydraulic machines.
• Turbines convert hydraulic energy or hydro-
potential into mechanical energy.
6. • Mechanical energy developed by turbines
is used to run electric generators coupled
to the shaft of turbines
• Hydro electric power is the most cheapest
source of power generation.
7. • Poncelet first introduced the idea of the
development of mechanical energy
through hydraulic energy
• Modern hydraulic turbines have been
developed by Pelton (impulse), Francis
(reaction) and Kaplan (propeller)
8.
9. Classification of Turbines
• On the basis of hydraulic action or type of energy at the inlet
– Impulse Turbine (Pelton wheel)
– Reaction Turbine (Francis turbine and Kaplan)
• On the basis of direction of flow through the runner
– Tangential flow turbine (pelton)
– Radial flow turbine (francis )
– Axial Flow Turbine (Kaplan)
– Mixed flow turbine (modern francis)
10. • On the basis of head of water
– High head turbine (pelton, H>250m)
– Medium head turbine (modern francis, 45-250m)
– Low head turbine (kaplan, <45m)
• On the basis of specific speed, Ns, of the turbine
– Low specific speed (pelton, 10-35)
– Medium (francis, 60-400)
– High specific speed (kaplan, 300-1000)
Specific speed is the speed of turbine for producing unit power under
unit head
11. • On the basis of head of water
– High head turbine (pelton, H>250m)
– Medium head turbine (modern francis, 45-250m)
– Low head turbine (kaplan, <45m)
• On the basis of specific speed, Ns, of the turbine
– Low specific speed (pelton, 10-35)
– Medium (francis, 60-400)
– High specific speed (kaplan, 300-1000)
Specific speed is the speed of turbine for producing unit power under
unit head
13. • The basic equation of fluid dynamics relating to
energy transfer is same for all rotodynamic
machines and is a simple form of " Newton 's
Laws of Motion" applied to a fluid element
traversing a rotor.
• Here we shall make use of the momentum
theorem as applicable to a fluid element while
flowing through fixed and moving vanes.
• Figure represents diagrammatically a rotor of a
generalised fluid machine, with 0-0 the axis of
rotation and ω the angular velocity.
• Fluid enters the rotor at 1, passes through the
rotor by any path and is discharged at 2.
14. • The points 1 and 2 are at r1 radii and r2 from the
centre of the rotor, and the directions of fluid
velocities at 1 and 2 may be at any arbitrary
angles. For the analysis of energy transfer due
to fluid flow in this situation, we assume the
following:
• (a) The flow is steady, that is, the mass flow
rate is constant across any section (no storage
or depletion of fluid mass in the rotor).
• (b) The heat and work interactions between the
rotor and its surroundings take place at a
constant rate.
15. • (c) Velocity is uniform over any area normal to
the flow. This means that the velocity vector at
any point is representative of the total flow over
a finite area. This condition also implies that
there is no leakage loss and the entire fluid is
undergoing the same process.
16. • The velocity at any point may be resolved into
three mutually perpendicular components as
shown in Fig. The axial component of velocity
Va is directed parallel to the axis of rotation , Vf
the radial component is directed radially through
the axis to rotation, while the tangential
component Vw is directed at right angles to the
radial direction and along the tangent to the rotor
at that part.
• The change in magnitude of the axial velocity
components through the rotor causes a change
in the axial momentum. This change gives rise
to an axial force, which must be taken by a
thrust bearing to the stationary rotor casing.
17. • The change in magnitude of radial velocity
causes a change in momentum in radial
direction.
• However, for an axisymmetric flow, this does not
result in any net radial force on the rotor. In case
of a non uniform flow distribution over the
periphery of the rotor in practice, a change in
momentum in radial direction may result in a net
radial force which is carried as a journal load.
The tangential component only has an effect on
the angular motion of the rotor.
• No torque is produced by axial and radial
components.
18. • Torque is exerted on the rotor only due to the
change in momentum of the tangential
component
• At inlet moment of momentum /mass
Vw1 r1
• At outlet moment of momentum / mass
Vw2 r2
Rate of change of moment of momentum =
m (Vw1 r1 - Vw2 r2)
m (Vw1 r1 – Vw2 r2) = T (Angular momentum theorem)
19. Rate of Energy imparted
E = T ω
E = m (Vw1 r1 – Vw2 r2) ω
E = m (Vw1 r1 ω – Vw2 r2 ω)
Where
r1 ω = Tangential / linear velocity at inlet = u1
r2 ω = Tangential / linear velocity at outlet = u2
E = m (Vw1 u1 - Vw2 u2) (1)
E/m = (Vw1 u1 - Vw2 u2) (2)
20. Equation 1, 2 and 3 are different form of a single
equation which is known as Euler’s equation.
21. Pelton Wheel Turbine
• Most commonly used impulse or tangential flow
turbine
• Named after its pioneer Leston A Pelton (1829-
1908).
• Suitable to be used for high head hydroelectric
power plants
22. Pelton Wheel Turbine
• In impulse turbine (Pelton wheel), the water from
a dam is made to flow through a pipeline, and
then the guide mechanism and finally through
the nozzle.
• In such a process, the entire available energy of
the water is converted into kinetic energy, by
passing it through the nozzles; which are kept
close to the runner.
• The water enters the running wheel in the form
of a jet ( or jets), which impinges on the buckets,
fixed to the outer periphery of the wheel.
23. Pelton Wheel Turbine
• The jet of water impinges on the buckets with a
high velocity, and after flowing over the vanes,
leaves with a low velocity; thus imparting energy
to the runner.
• The pressure of the water, both at entering and
leaving the vanes, is atmospheric.
24. Components
The Pelton wheel has the following components:
1.Nozzle
2. Runner and Buckets
3. Casing and
4. Breaking jet
25.
26. 1. Nozzle with guide mechanism
• Function is to convert pressure energy to high velocity
energy in the form of jet.
• A spear is provided in the nozzle to control the flow due
to varying load on the turbine.
• Nozzle is made of either cast iron or cast steel
• Nozzle mouth ring and spear tip are made of non-
abrasive material (stainless steel or bronze) and can
easily be replaced
• Sudden closure of nozzle(s) results in sudden increase
in pressure which may burst the pipe; in order to avoid
such mishap, an additional nozzle ( known as bypass
nozzle) is provided through which the water can pass,
without striking the buckets.
27. • Sometimes a plate (known as deflector) is provided to
the nozzle, which is used to deflect the water jet, and
preventing it from striking the buckets.
• The nozzle is kept very close to the buckets, in order to
avoid minimise the losses due to windage.
28. 2. Runner and Buckets
• Runner is a circular disc with a number of evenly
spaced vanes or buckets semi-ellipsoidal in
shape
• Each bucket is divided into two symmetrical
compartments by a sharp edge ridge called
splitter
• Jet of water normally impinges on the splitter
dividing into two parts and leaving at the outer
edge
29. • To get the full reaction of the jet, it has to
be turned through 180 degrees but it may
strike the incoming bucket thus retarding
its speed.
• The angle through which the jet is turned
is normally kept between 160 and 170
degrees.
30. • As the splitter takes the full impact of the jet, so
it has to be quite strong and should not be
having a sharp edge
• To avoid erosion of buckets due to impurities
present in water, cast iron buckets are used for
low head plants while cast steel, stainless steel
and bronze are used for medium head plants
• Buckets are either cast as an integral part or are
bolted to the rim.
31.
32. 3. Casing
• It does not have any hydraulic function
• Provided to avoid accidents, splashing of
water and to lead the water to the tail race.
• Made in two parts to facilitate assembling
• Material used is usually cast iron.
33. 4. Breaking Jet
• Whenever the turbine has to be brought to
rest, the nozzle is completely closed. It
has been observed that it goes on
revolving for a considerable time, due to
inertia, before it comes to rest.
• In order to bring the runner to rest in a
short time, a small nozzle is provided in
such a way that it will direct a jet of water
on the back of the buckets. It acts as a
break for reducing the speed of the
36. Let
V = Absolute velocity of the entering water
Vr = Relative velocity of water and bucket at inlet
Vf = Velocity of flow at inlet
V1, Vr1, Vf1 = Corresponding values at outlet
D = Diameter of the wheel
d = Diameter of the nozzle
H = Total head of water under which wheel is
working
= Angle of the blade tip at outletφ
37. Inlet velocity triangle is straight line as shown in
Fig.
From velocity triangle at inlet
As a matter of fact, the shape of the outlet velocity
triangle depends upon the value of Vw1. If is in the
same direction as that of jet, its value is taken as
positive. However, if is in the opposite direction (
as shown in the fig. ) its value is taken
vVVr
Vf
VwV
−=
=
=
0
38. as negative. The relationship between these two
velocity triangles is
Work done per kN of water
)(1
1
vVVV
vvv
rr −==
==
( )11/ vVvVmE ww −=
( )111 cos vVV rw −= φ
( )11/1/ vVvVgmgE ww −=
( )11)(/1/ vVvVgmgE ww −−=
42. • It means that the velocity of the wheel, for
maximum hydraulic efficiency, should be
half of the jet velocity. Therefore,
maximum work done / kN of water
( )φcos1)(/ +−= vVgv
( )φcos1)(2/2/ +−= VVgV
( )( )gV 4/cos1 2
φ+=
44. Power Produced by an Impulse
Turbine
• Some work is done per kN of water, when
the jet strikes the buckets of an impulse
turbine. If we know the quantity of water
flowing through jet per second and the
amount of work done per second, the
power produced can be calculated as
(kW)
w = Specific weight of water
H = Head of water
Q = Discharge
wQHP =
45. Efficiencies of an Impulse
Turbine
• In general the term efficiency may be
defined as the ratio of work done to the
energy supplied.
• An impulse turbine has the following three
types of efficiencies
1.Hydraulic efficiency
It is the ratio of work done, on the wheel, to
the energy of the jet
Already calculated
46. Efficiencies of an Impulse
Turbine
2. Mechanical efficiency
It has been observed that all the energy
supplied to the wheel does not come out
as useful work. But a part of it is
dissipated in overcoming friction of
bearings and other moving parts. Thus the
mechanical efficiency is the ratio of actual
work available at turbine to the energy
imparted to the wheel.
47. Efficiencies of an Impulse
Turbine
3. Overall efficiency
It is the measure of the performance of a
turbine and is the ratio of actual power
produced by the turbine to input energy to
the turbine.
wQH
P
o =η
48. Number of Jets of a Pelton
Wheel
• A Pelton turbine, generally, has a single
jet only. But whenever a single jet can not
develop the required power, we may have
to employ more than one jets.
• While designing the jets care should
always be taken to provide the jets are
equidistant on the outer periphery of the
wheel.
50. Design or working proportions
of pelton wheel
A Pelton wheel is designed to find out the following data:
1. Diameter of the wheel
2. Diameter of the jet
3. Size ( i.e. Width and depth ) of the buckets
4. No. of Buckets
While designing a Pelton wheel, if sufficient data is not
available then the following assumptions are made,
which are meant for the best results:
1. Overall efficiency between 80% and 87% ( preferably
85%)
2. Coefficient of velocity 0.99 (preferably 0.985)
51. Design or working proportions
of pelton wheel
3. Ratio of peripheral velocity to the jet velocity as 0.46
52. Dimensions of bucket
• Width B of the bucket is normally taken as 4 to 5 d (d =
diameter of the jet)
• The depth of the bucket (c) normally 1.2 d
• Length L of the bucket is 2.4 to 3.2d
• Other dimensions are
= 10 to 15 degreesɸ
β1 = 5-8 degrees
53. Number of buckets
• The number of buckets is decided such that the
frictional loss is minimum and the path of the jet
is not disturbed.
• Also the jet must be fully utilised
• Taygun gave the following relation for the
calculation of number of buckets.
D = Mean Bucket diameter
d = Diameter of the jet
155.015
2
1
+=+=
d
D
d
D
bn
54. Design or working proportions
of pelton wheel
If a turbine is working under a net head H, then the ideal
velocity of the wheel is given by
But due to the frictional loss, the actual velocity is slightly
less than this, so the velocity V of jet at inlet
Cv (coefficient of velocity ranges from 0.97 to 0.99)
gH2
gHCV v 2=
55. Although, theoretically,
But actually, occurs when
v= 0.46V
If v is expressed in terms of speed ratio (ratio of tangential
velocity of wheel to theoretical velocity of jet), the speed
ratio of a pelton turbine is given by
Ku ranges from 0.43 to 0.47
2/Vv =
maxhη
gH
v
Ku
2
= gHv 246.0=
56. • The angle through which the jet is deflected is taken as
165 degree and β at the outlet velocity triangle is 15
degrees.
• Least diameter of the jet is given by
2/1
2/1
2/1
2
2
5416.0
)
298.0
4
(
2
4
2
4
=
××
=
=
==
H
Q
H
Q
g
d
HgC
Q
d
gHCdaVQ
v
v
π
π
π
57. If D is the mean diameter of the wheel and
N is the rotation of the wheel in rpm
N
gHK
N
v
D
DN
v
u
ππ
π
2.6060
60
==
=
58. Ratio of diameter of the runner to the least
diameter of the jet is known as jet ratio D/d
D/d is taken between 11 to 14 for maximum
efficiency
Normal value is taken as 12 if not given
59. 1. A Pelton wheel develops 2000 kW under a head of 100 m, and
with an overall efficiency of 85%. Find the diameter of the nozzle, if
the coefficient of velocity for the nozzle is 0.98.
2. A Pelton wheel having semi-circular buckets and working under a
head of 140 m is running 600 rpm. The discharge through the
nozzle is 500 lit/s and diameter of the wheel is 600 mm. Find
a) Power available at the nozzle
b) Hydraulic efficiency of the wheel, if coefficient of velocity is 0.98)
3. A Pelton wheel, working under a head of 500 m, produces 13000
kW at 430 rpm. If the efficiency of the wheel is 85%. Determine (a)
discharge of the turbine (b) diameter of the wheel and (c) diameter
of the nozzle. Assume suitable data.
60. 4. In hydraulic scheme, the distance between high level reservoir at the
top of mountains and turbine is 1.6 km and difference of their
levels is 500 m. The water is brought in 4 penstocks each of 0.9 m
connected to a nozzle of 200 mm diameter at the end. Find:
(a) Power of each jet and
(b) total power available at the reservoir, taking the value of
Darcy’s coefficient of friction as 0.008
5. A power house is equipped with impulse turbines of pelton type.
Each turbine delivers a maximum power of 14250 kW, when
working under a head of 900 m and running at 600 rpm.
Find the diameter of the jet, and the mean diameter of the wheel.
Take overall efficiency of the turbine as 89.2%.
61. 6. A Pelton wheel is required to generate 3750 kW under an effective
head of 400 m. Find the total flow in lit/s and size of the jet.
Assume generator efficiency 95%, overall efficiency 80%,
coefficient of velocity 0.97, speed ratio 0.46. If the jet ratio is 10,
find mean diameter of runner.
7. A Pelton wheel has a mean bucket speed of 15m/s with a jet of
water impinging with a velocity of 40m/s and discharging 450lit/s. If
the buckets deflect the jet through an angle of 165o
, find the power
generated by the wheel.
8. A Pelton wheel has a tangential velocity of buckets of 15 m/s. The
water is being supplied under a head of 150 m at the rate of 200
lits/s. The buckets deflects the jet through an angle of 160. If the
coefficient of velocity for the nozzle is 0.98, find the power
produced by the wheel and its hydraulic efficiency.
62. 9. A Pelton wheel is supplied water under a head of 200 m through a
100 mm diameter pipes. If the quantity of water supplied to the
wheel is 1.25 cumecs. Find the number of jets. Assume coefficient
of velocity 0.97.
10. A Pelton wheel has to develop 5000 kW under a net head of 300 m,
while running at a speed of 500 rpm. If the coefficient of velocity for
the jet = 0.97, speed ratio = 0.46 and the ratio of the jet diameter is
1/10 of wheel diameter, calculate (a) quantity of water supplied to
the wheel (b) diameter of pitch circle (c) diameter of jets and (d)
number of jets.
11. Design a Pelton wheel for a head of 350 m at a speed of 300 rpm.
Take overall efficiency of the wheel as 85% and ratio of the jet to
the wheel diameter as 1/10.
63. 12. Design a Pelton wheel for the for following data:
Head of water = 150 m
Power to be developed = 600 kW
Speed of wheel = 360rpm
Assume, reasonably, the missing data.