Wheel space Temperature
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Wheel space temperature is monitored to protect hot gas components of gas turbine (Nozzles and Buckets) from thermal stresses.
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(ME- 495 Laboratory Exercise – Number 1 – Brayton Cycle -.docx
(
ME- 495 Laboratory Exercise
–
Number 1
– Brayton Cycle -
ME Department, SDSU
-
Nourollahi
) (
11
)Brayton Cycle (Gas Turbine Power Cycle)
Objective
The objective of this lab exercise is to gain practical knowledge of the Brayton cycle. The Brayton cycle illustrates the cold-air-standard assumption (constant specific heats at room temperature) model of a gas turbine power cycle. A portable propulsion laboratory[footnoteRef:1] containing a Model SR-30 turbojet is used in this exercise. The student shall apply the basic equations for Brayton cycle analysis by using empirical measurements at different points in the Brayton cycle. [1: Manufactured by Turbine Technologies Ltd. Called TTL Mini-Lab]
Figure 1: TTL Mini-Lab manufactured by Turbine Technologies Ltd. (TTL)Background
A simple gas turbine engine has three main components: a compressor section, a combustion chamber and a turbine section. Basic operation entails drawing atmospheric air into the compressor where it is heated through compression. The compressed and heated air is mixed with fuel in the combustion chamber. The air/fuel mixture burns at constant pressure in the combustion chamber. The resulting hot gas is directed to the turbine section where it expands. As the gas expands it produces a thrust reaction and performs work by turning the turbine. The turbine is connected to the compressor by a shaft. The resulting shaft work is used to drive the compressor and auxiliary power supplies.
The gas turbine has wide spread application. Most notably, it is used to power and propel aircraft and large ships. In some cases only the thrust resulting from the expanding gas exiting the turbine is used for propulsion and the shaft work is used to drive the compressor and power electrical systems. In turbo-fan engines some of the shaft work is used to drive a large fan that aids in propulsion. In other applications, such as helicopters and ships, propulsion is achieved through the shaft work, which is used to drive transmission/gear boxes that are connected to the rotor blades or propeller, respectively. Gas turbines are also commonly used to drive large electrical generators in power plant applications.Theory
The Brayton cycle consists of four basic processes (see Figure3 & 4). Low-pressure air is drawn into the compressor section and undergoes isentropic compression. Next, the heated and compressed air is combined with fuel in the combustion chamber. The air/fuel mixture experiences reversible constant pressure heat addition. The resulting hot gas enters the turbine section where it undergoes isentropic expansion. To complete the cycle (the exhaust and intake in the open cycle) the gas experiences reversible constant pressure heat rejection.
Thermodynamics and the First Law of Thermodynamics determine the overall energy transfer. The following assumptions are used when analyzing the gas turbine cycles:
1. The working fluid (air) is an ideal gas throughout the cycle.
2. The combust ...
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An experimental investigation of engine coolant temperature on exhaust emissi...
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Gas turbine power plant
The document provides information about gas turbine power plants. It discusses that gas turbines were invented in 1930 and are now commonly used for aircraft propulsion and power generation. A gas turbine works by compressing air, mixing it with fuel for combustion, and using the hot gases to power a turbine which drives both the compressor and a generator. The key components of a gas turbine are the compressor, combustion chamber, and turbine. The document also outlines the basic thermodynamic Brayton cycle that gas turbines are based on and discusses configurations like regenerative cycles, intercooling, and reheat to improve efficiency.
The Design of Small Solar Thermal Dish Stirling 500 W Stand Alone in Thailand.
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Electrical Motor
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Thermal Analysis of the Wheel for Urban Rail Vehicle Considering Emergency Br...
1. A thermal analysis of an urban rail vehicle wheel model was conducted considering emergency braking conditions. The thermal loads on the wheel were calculated using a heat flux density approach.
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3. Comparisons between a new wheel and a wheel worn to the limit found that the maximum temperature and thermal stress in the worn wheel was higher, due to its thinner rim profile allowing for faster heat transfer.
JET ENGINE BASIC
This document provides an overview of jet engine basics. It describes the main types of jet engines as piston engines, gas turbine engines, and turbojet engines. The key parts of a gas turbine jet engine are then explained, including the compressor, combustor, turbine, and types of shafts. The different gas turbine engine types - turbojet, turboprop, turbofan, and turboshaft - are also defined along with their typical applications.
FUNDAS OF GAS TURBINE ENGINE
Preparing for EASA Mod.15 Gas turbine engines . Then avoid reading lengthy books here are my personal short notes and explanations and important topics for Mod.15
Jet engine
This document provides an overview of jet engine basics. It discusses the main types of jet engines including turbojet, turbofan, turboprop, and turboshaft. The turbofan engine is described as employing a bypass design that provides around 80% of total thrust from bypass airflows. The core components of a jet engine are also summarized, including the compressor, combustor, turbine, and their basic functions in the Brayton cycle that powers gas turbine engines.
Ambrish
The document discusses closed cycle gas power plants. It begins with an introduction that defines closed cycle systems as those where a working gas like air is compressed, heated, expanded through a turbine to produce power, cooled, and recycled through the system. It then discusses the main components of closed cycle plants including compressors, combustion chambers, turbines, generators, and intercoolers. The working principle involves isentropic compression, constant pressure heating, isentropic expansion in the turbine, and constant pressure cooling. Key improvements discussed include higher operating temperatures through improved materials and cooling, and cycle modifications like regeneration to increase efficiency. Advantages are high efficiency while disadvantages include greater complexity versus open cycle plants.
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"Agnee" Bogie Hearth Oil Fired Furnace Project
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Wheel space Temperature
- 1. Wheel space temperature 2×GE FRAME 9FA GAS TURBINE 750MW COMBINED CYCLE POWER PLANT
- 2. What is Wheel space of a turbine? Wheelspace It is the space (very small axial distance) between rotating wheel that is turbine buckets and the stationary diaphragms which the turbine nozzles are installed on).
- 3. What are Wheel space thermocouple? Wheel space T/Cs are used to measure temperature around wheel space region of gas turbine. Mounted wheelspace thermocouple
- 4. Why Wheel space temperature is monitored monitoring? There are two wheel spaces per turbine stage where temp is monitored --a forward wheel space and an aft wheel space. In order to protect the hot gas components temp is measured
- 5. Turbine Hot gas component 1st stage forward wheel space First stage aft wheel space 2nd stage a forward wheel space 2nd stage a aft wheel space 3rd stage forward wheel space 3rd stage aft wheel space
- 6. Turbine Hot gas component damage Bucket fail at the connector to disk
- 7. Wheel Space Temperature at start up 1FI-1 :- first forward inner wheel space thermocouple
- 8. Wheel Space Temperature at Acceleration
- 9. Wheel Space Temperature at FSNL
- 10. Wheel Space Temperature at Loading
- 11. Wheel Space Temperature at Preselect Load
- 12. Wheel Space Temperature at Base load
- 13. Comparative study SPEED (RPM) LOAD (MW) FIRST STAGE FORWARD AND AFT WHEEL SPACE TEMPERATURE (AVERAGE) 5 at (START UP) 0 26 1564 at (ACCLN) 0 27 3011 at (FSNL) 0 30 3000 at (LOADING) 24 43 3000 at (PRESELECT LOAD) 146.9 487 3000 at (BASE LOAD) 233 490
- 14. 0 100 200 300 400 500 600 50 100 150 200 250 300 temperature Temp The plot shows as the load increases temperature around wheel space region increases. Load Graph indicating comparative study.