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What does a diffuser do in a gas turbine engine?
Diffuser is one key component of the gas turbine combustor following the compressor. Its primary function is to slow down the air flow delivered by the compressor in order to promote efficient combustion and avoid large total pressure losses.
What is the purpose of the diffuser section in a axial flow gas turbine engine?
The diffuser vanes direct the flow of air from the impeller to the manifold at an angle designed to retain the maximum amount of energy that is provided by the impeller. They also deliver the air to the manifold at a velocity and pressure satisfactory for use in the combustion chambers.
What is the purpose of combustor?
The important function of the combustor is to efficiently mix air with the fuel and burn it in a manner that provides a high stagnation temperature with small losses in stagnation pressure and low pollutant emissions.
At what stage in a turbine engine are gas pressures the greatest?
Turbine Engines
| Question | Answer |
|---|---|
| Explain how Automatic Compressor Bleed valves prevent compressor stalls. | Bleed air valves (connected to fuel control) open to reduce back-pressure, letting more air into the engine |
| At what stage in a turbine engine are gas pressures the greatest? | At the compressor outlet. |
How does the combustor work in a gas turbine?
In a gas turbine engine, the combustor or combustion chamber is fed high pressure air by the compression system. The combustor then heats this air at constant pressure. After heating, air passes from the combustor through the nozzle guide vanes to the turbine.
What do you need to know about a gas turbine?
Key Words: Combustion chamber, heat transfer, thermal and cooling analysis. A gas turbine, also called a combustion turbine, is a type of continuous combustion, internal combustion engine. The main elements common to all gas turbine engines are: A downstream turbine on the same shaft as the compressor.
What is the residence time of a gas turbine combustor?
Gas turbine combustors have much smaller residence times than this and a 1m long combustor with a 25m/s reference velocity at 700K has a residence time at 1800K of 15ms, and normally combustors are shorter than this so residence times are usually <10ms, as discussed in more detail later.
How is the Borghi diagram of a gas turbine created?
The Borghi diagram results from theoretical considerations based on dimensional grounds and should be interpreted as such. The underlying combustion conception is idealized insofar that it assumes single-step chemistry, high activation energy, Le = 1, equal diffusivities of reactants, and steady and spatially uniform characteristics.