This document analyzes the power and efficiency of a Francis turbine with different heads. It begins with an abstract discussing the goals of analyzing a Francis turbine's performance under varying heads. It then provides background on Francis turbines, describing their main components like the casing, guide vanes, runner, and draft tube. The document also explains how Francis turbines work as a reaction turbine that converts hydraulic energy to mechanical energy. It presents observations, calculations and results from an experiment measuring the power output of a Francis turbine with a head of 15.26 meters, including its efficiency of 34%.
A turbine (from the Latin turbo, a vortex, related to the Greek is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced by a turbine can be used for generating electrical power when combined with a generator A turbine is a turbomachine 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. Early turbine examples are windmills and waterwheels.
A turbine (from the Latin turbo, a vortex, related to the Greek is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced by a turbine can be used for generating electrical power when combined with a generator A turbine is a turbomachine 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. Early turbine examples are windmills and waterwheels.
from this ppt you can almost aware about the operation of hydraulic turbines and various specification releated to it...
if you want to attains the knowledge about the turbines then must watch this ppt,... thankyou!
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from this ppt you can almost aware about the operation of hydraulic turbines and various specification releated to it...
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FRANCIS TURBINE WORKING PRINCIPLES AND APPLICATIONGodlistenNyari
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User
Francis turbine design parameters
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The design parameters for a Francis turbine include:
Flow rate: The amount of water flowing through the turbine.
Head: The height difference between the water source and the turbine's outlet.
Runner diameter: The size of the turbine's rotating component.
Blade angles: Angles of the blades relative to the direction of water flow.
Efficiency: The ratio of output power to input power, important for maximizing energy conversion.
Speed: Rotation speed of the turbine, usually determined by the generator it's connected to.
Materials: Selection of materials for durability and performance under varying conditions.
Cavitation: Preventing the formation of cavitation bubbles to avoid damage to the turbine.
These parameters are optimized based on factors like site conditions, energy output requirements, and economic considerations.
User
Runner diameter in Francis turbine
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The runner diameter in a Francis turbine typically ranges from a few meters to over 10 meters, depending on the specific application and design requirements. Smaller turbines may have runner diameters in the range of 1 to 3 meters, while larger turbines for hydropower plants can have diameters exceeding 10 meters. The diameter is chosen to optimize the turbine's performance based on factors such as flow rate, head, and efficiency.
User
Blade angles in Francis turbine
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The blade angles in a Francis turbine are crucial for efficient energy conversion. There are two primary angles:
Guide vane angle: Also known as the wicket gate angle, it controls the flow of water entering the turbine. Adjusting this angle regulates the amount of water flow, optimizing turbine performance under different operating conditions.
Runner blade angle: These angles determine how efficiently the turbine extracts energy from the water flow. The runner blade angle affects the interaction between the water and the turbine blades, influencing both the turbine's power output and its efficiency.
Both angles are carefully designed and optimized to maximize the turbine's efficiency across its operating range, balancing factors such as flow velocity, pressure distribution, and hydraulic losses.
User
Francis turbine
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The Francis turbine is a type of water turbine used for generating electricity in hydroelectric power plants. It's a reaction turbine, meaning it operates by both impulse and reaction forces.
Here's how it works:
Water enters the turbine through the spiral casing and flows into the runner.
The runner consists of a series of curved blades that are shaped to efficiently capture the kinetic energy of the flowing water.
As the water flows over the curved blades, it changes direction and creates a reaction force that causes the runner to rotate.
The rotating runner is connected to a shaft, which is in turn connected to an electric generator.
As the runner rotates, it drives the generator, producing electricity.
Francis turbines are v
Modal 04: Hydraulic Turbines (Question Number 7 a - 7 b & 8a - 8b)
i. Definition
ii. Classification of Hydraulic Turbines
iii. Various efficiencies of Hydraulic Turbines and Various types of Head
iv. Pelton Wheel – Principle of working,
Velocity triangles,
Maximum efficiency
Design parameters,
Numerical problems.
v. Francis turbine – Principle of working
Velocity triangles
Design parameters
Numerical problems
vi. Kaplan and Propeller turbines - Principle of working
Velocity triangles
Design parameters
Numerical Problems.
vii. Theory and types of Draft tubes.
Design and Fabrication of Runner Blades of Cross Flow Turbineijtsrd
This paper describes the design and fabrication of runner blades for cross flow turbine is presented. In this paper, the cross flow turbine's runner is designed to produce 100 W electric powers from head of 4 m and the flow rate of 0.004 m ^3 s. For the given capacity and head of the turbine, the dimensions of runner diameter and width 265 mm and 132 mm is obtained respectively. The detail design calculation of the runner is described in this thesis. It is applicable to wide range of flow rate adjusting the runner length. The term hydropower refers to shaft power generated by converting potential and kinetic energy of power. By using water power, the generation of electrical power is well known and widely used throughout the world. In hydropower plant, water turbine is one of the most important parts for generating electricity. This paper is to fulfill the required electricity in rural area. Ma Thu Zar Win | Ma Myat Win Khaing | Ma Yi Yi Khin "Design and Fabrication of Runner Blades of Cross-Flow Turbine" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27990.pdfPaper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/27990/design-and-fabrication-of-runner-blades-of-cross-flow-turbine/ma-thu-zar-win
The pdf contains explanation about the centrifugal pumps. It is usually studied by Mechanical or Civil engineering students. This pdf file will help for the students from these fields.
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experimental analysis on francis turbine & to find out the power
1. www.semargroup.org,
www.ijsetr.com
ISSN 2319-8885
Vol.03,Issue.05,
April & May-2014,
Pages:0836-0839
Copyright @ 2014 SEMAR GROUPS TECHNICAL SOCIETY. All rights reserved.
A Experimental Analysis on Francis Turbine & to Find Out the Power
And Efficiency on Diferent Types of Heads
NEERAJ KUMAR
1
, GOURAV DUREJA
2
1
Research Scholar, M.M.Group of Institutions, Ramba Karnal, India, E-mail: Neeraj_4296@yahoo.com.
2
Asst Prof, M.M.Group of Institutions, Ramba Karnal, India, E-mail: gurugourav@gmail.com.
Abstract: The objective of this article is to analyze the power & efficiency of Francis turbine and analyze its performance with
different heads. This article will help the researchers while working on francis turbine & analyzing its various components. In
this article we study the details of francis turbine & measure the power output on francis turbine. This article will provide
background and progress of various parameters in Educational field.. The future directions of the commercial activities to
implement the new findings will be the central theme. The immerging new partnership and challenges projected will also be
discussed. This article will help engineering scholar in their experiments while analyzing.
Keywords: Francis-Turbine, Head, Manometer, Energy, Pressure, Discharge.
I. INTRODUCTION
Francis turbine named after james bichens francis, is a
rection type of turbinie for medium high to medium low
heads & medium small to medium large quantity of water.
Francis Turbine is a prime over. It converts the hydraulic
energy (head of water) into mechanical energy, which in
turn can be transformed into electrical energy by coupling a
generator to the turbine. Francis Turbine is a radial inward
flow reaction turbine. This has the advantage of centrifugal
force acting against the flow, thus reducing the tendency of
the wheel to race. Generating energy from the power of
water represents large amounts of clean, renewable energy.
71 percent of the earth’s surface is covered by water. The
world’s hydro power potential amounts to 20 billion Mega
Watt hours per year and only 30 percent of this has been
developed so far.
II. VARIOUS PARTS OF FRANCIS TURBINE
The main parts of Francis Turbine are:
A. Casing
The runner is completely enclosed in an air-tight spiral
casing. The casing and runner are always full of water.
Casing is used for safety purposes & splashing of water
from outside.
B. Guide Mechanism
It consists of a circular wheel all round the runner of the
turbine. The stationary guide vanes are fixed on the guide
wheel as shown in fig 1. The guide vanes allow the water to
strike the vanes fixed on the runner without shock at inlet.
Also width between the two adjacent vanes can be altered so
that amount of water striking the runner can be varied.
Fig 1. Guide Vanes.
C. Runner
It is a circular wheel on which a series of Radial Curved
Vanes are fixed. The vanes are so shaped that the water
enters and leaves the runner without shock as shown in fig2.
D. Draft Tube
The pressure at the exit of the runner of Reaction Turbine
is generally less than atmospheric pressure. The water at
exit cannot be directly discharged to the tail race. A tube or
2. NEERAJ KUMAR, GOURAV DUREJA
International Journal of Scientific Engineering and Technology Research
Volume.03, IssueNo.05, April & May-2014, Pages: 0836-0839
pipe of gradually increasing area is used for discharging
water from the exit of turbine to the tail race. This tube of
increasing area is called Draft Tube. One end of the tube is
connected to the outlet of runner while the other end is sub-
merged below the level of water in the tail-race.
Fig 2. Runner.
Fig 3. Components of Francis Turbine.
III. WORKING OF FRANCIS TURBINE
A. Reaction Turbines
Reaction turbines are those turbines which operate under
hydraulic pressure energy and part of kinetic energy. In this
case, the water reacts with the vanes as it moves through the
vanes and transfers its pressure energy to the vanes so that
the vanes move in turn rotating the runner on which they are
mounted.
The main types of reaction turbines are
Radially outward flow reaction turbine: This reaction
turbine consist a cylindrical disc mounted on a shaft and
provided with vanes around the perimeter. At inlet the water
flows into the wheel at the centre and then glides through
radially provided fixed guide vanes and then flows over the
moving vanes. The function of the guide vanes is to direct
or guide the water into the moving vanes in the correct
direction and also regulate the amount of water striking the
vanes. The water as it flows along the moving vanes will
exert a thrust and hence a torque on the wheel thereby
rotating the wheel. The water leaves the moving vanes at the
outer edge. The wheel is enclosed by a water-tight casing.
The water is then taken to draft tube.
Radially inward flow reaction turbine: The constitutional
details of this turbine are similar to the outward flow turbine
but for the fact that the guide vanes surround the moving
vanes. This is preferred to the outward flow turbine as this
turbine does not develop racing. The centrifugal force on the
inward moving body of water decreases the relative velocity
and thus the speed of the turbine can be controlled easily.
Runner with vanes: The runner is mounted on a shaft and
the blades are fixed on the runner at equal distances. The
vanes are so shaped that the water reacting with the m will
pass through them thereby passing their pressure energy to
make it rotate the runner.
IV. DIAGRAM OF FRANCIS TURBINE
A. Francis turbine
Fig 4. Francis turbine.
3. A Experimental Analysis on Francis Turbine & to Find Out the Power And Efficiency on Diferent Types of Heads
International Journal of Scientific Engineering and Technology Research
Volume.03, IssueNo.05, April & May-2014, Pages: 0836-0839
The principal feature of a francis turbine that
distinguishes it from an impulse turbine is that only a part of
the total head available at the inlet to the turbine is
converted to velocity head, before the runner is reached.
Also in the reaction turbines the working fluid, instead of
engaging only one or two blades, completely fills the
passages in the runner. The pressure or static head of the
fluid changes gradually as it passes through the runner along
with the change in its kinetic energy based on absolute
velocity due to the impulse action between the fluid and the
runner. Therefore the cross-sectional area of flow through
the passages of the fluid. A reaction turbine is usually well
suited for low heads. A radial flow hydraulic turbine of
reaction type was first developed by an American Engineer,
James B. Francis (1815-92) and is named after him as the
Francis turbine. The schematic diagram of a Francis turbine
is shown in Fig 3 and 4.
B. A Francis turbine comprises mainly the four
components
spiral casing,
Guide on stay vanes,
Draft-tube as shown in Fig 4,
Runner blades.
Spiral Casing: Most of these machines have vertical shafts
although some smaller machines of this type have horizontal
shaft. The fluid enters from the penstock (pipeline leading to
the turbine from the reservoir at high altitude) to a spiral
casing which completely surrounds the runner. This casing
is known as scroll casing or volute. The cross-sectional area
of this casing decreases uniformly along the circumference
to keep the fluid velocity constant in magnitude along its
path towards the guide vane. This is so because the rate of
flow along the fluid path in the volute decreases due to
continuous entry of the fluid to the runner through the
openings of the guide vanes or stay vanes.
Fig 5. Spiral Casing.
Guide or Stay Vane: The basic purpose of the guide vanes
or stay vanes is to convert a part of pressure energy of the
fluid at its entrance to the kinetic energy and then to direct
the fluid on to the runner blades at the angle appropriate to
the design. Moreover, the guide vanes are pivoted and can
be turned by a suitable governing mechanism to regulate the
flow while the load changes. The guide vanes are also
known as wicket gates. The guide vanes impart a tangential
velocity and hence an angular momentum to the water
before its entry to the runner. The flow in the runner of a
Francis turbine is not purely radial but a combination of
radial and tangential. The flow is inward, i.e. from the
periphery towards the centre. The height of the runner
depends upon the specific speed. The height increases with
the increase in the specific speed. The main direction of
flow change as water passes through the runner and is
finally turned into the axial direction while entering the draft
tube.
Draft Tube: The draft tube is a conduit which connects the
runner exit to the tail race where the water is being finally
discharged from the turbine. The primary function of the
draft tube is to reduce the velocity of the discharged water to
minimize the loss of kinetic energy at the outlet. This
permits the turbine to be set above the tail water without any
appreciable drop of available head. A clear understanding of
the function of the draft tube in any reaction turbine, in fact,
is very important for the purpose of its design. The purpose
of providing a draft tube will be better understood if we
carefully study the net available head across a reaction
turbine.
V. OBSERVATIONS / CALCULATION / RESULT*
Data:-
g =9.81m/s2
P m =1360kg/m3
D =0.08m
dR= 0.012m
W3=1.2 Kg
4. NEERAJ KUMAR, GOURAV DUREJA
International Journal of Scientific Engineering and Technology Research
Volume.03, IssueNo.05, April & May-2014, Pages: 0836-0839
Pw =1000 kg/m3
Cv =0.98
dB =0.2m
W4 =0. Kg
Calculations:
H= 10(Pd + Ps/ 760), m of water =…15.26 m of water
A= π/4 D2
, m2
=…5.02x10-3
. m2
V = CV X√ 2GH X (ρm/ ρw -1), m/sec =2.67m/sec
T= (W 1+W3-W2) X g X Re , Nm =0.955 Nm
Eo = 2x π x N x T/60x1000, KW = 0.332 KW
Q= Vx A, m3
/Sec=0.013 m3
/Sec
h=h1- h2/100 m =0.03m
Ei = ρw x gx Q x H/100, KW = 9.60KW
Re = dB + 2dR/2, m =0.112 m
ηt = Eo/ Ei x 100 % = 34 %
Nomenclature:
A= Cross – Sectional area of pipe, m2
Cv= Coefficient of pilot tu
D= Diameter of Pipe , m
db= Diameter of brake drum , m
dR= Diameter of rope ,m
Ei=Input power kW
Eo= Output Power, kW
g=Acceleration due to gravity, m/s2
H=Total head, m
h=Differential Pressure of manometer, m
h1, h2=Manometric reading at both pints, CM
N=RPM of runner shaft
Pd=Devilry Pressure, kg/cm2
Ps=Suction pressure, mmHg
Q=Discharge m3
/sec
Re = Equivalent Radius, m
T=Torgue / Nm
V=Velocity of water, m/s
W1= Applied weight, Kg
W2=Dead weight (obtain from spring balance ),Kg
W3=Weinght of hanger, Kg
W4= Weight of rope , Kg
pw=Density of water ,kg/ m3
pm=Density of Manometer fluid i.e.Hg, kg/ m3
nt=Turbine efficiency
VI. REFERENCES
[1] Collaboration for Establishing Francis Turbine
Manufacturing and Testing Facility in Nepal, Supriya
Koirala*, Sudip Adhikari, Biraj S. Thapa, Bhola Thapa, and
Ole G. Dahlhaug, Rentech Symposium Compendium,
Volume 1, March 2012.
[2] Voith Hydro Holding GmbH & Co. KG
,Alexanderstrasse 11 ,89522 Heidenheim/Germany ,Tel.
+49 7321 37 0 Fax +49 7321 37 7828 ,info. Voithhydro
@voith.com ,www.voithhydro.com, A Voith and Siemens
Company.
[3] A Text Book of Fluid Mechanics and Hydraulic
Machines. Front Cover. R. K. Bansal. Firewall Media, Jan
1, 2005 - Fluid mechanics.
[4] Hydraulics and Hydraulic Machines ,. M.N. Shesha
Prakash, Professor, J.N.N. College of Engineering,
Shimoga.
[5] Modeling of fluid flow inside UMP’S francis turbine
using ,computational fluid dynamics (CFD) , Muhammad
nur bin hashim , Faculty of Mechanical Engineering
University malaysia pahang , Thesis , ( November ,2009).
[6] Mr. Sudip Adhikari is a graduate of Mechanical
Engineering from Kathmandu University (KU), and is
working at the Turbine Testing Lab as a Research Assistant.
Author’s Profile:
Neeraj Kumar received the B.Tech in
Mechanical Engineering from N.C.C.E
(ISRANA) Panipat, Haryana During
2008 & M.Tech in thermal Engineering
from NIT KKR INDIA DURING 2012.
He join the MMGI Ramba Karnal India
college as a Assistant Professor in
Mechanical Department.
Gourav Dureja received the B.Tech in
Civil Engineering from M.M. University
Mullana Haryana during 2013 he join the
MMGI Ramba Karnal, India College as a
Lecturer in Civil Department.