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Which component of a gas turbine consumes maximum power?

Which component of a gas turbine consumes maximum power? Correct Answer Compressor

Concept:

Gas turbines operate on the Brayton cycle/Joule cycle. The Joule cycle consists of four internally reversible processes:

  • Isentropic compression (in a compressor)
  • Constant-pressure heat addition
  • Isentropic expansion (in a turbine)
  • Constant-pressure heat rejection

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Main components for gas turbine:

Combustion chamber: 

  • The compressed air from the air compressor is drawn to the combustion chamber. 
  • The fuel is injected into the air and then ignited in the combustion chamber. 
  • It increased the pressure and temperature of the air instantaneously.

Turbine: 

  • The high pressure and temperature air are expanded in the turbine.
  • The turbine is also of the rotary type. During the expansion, the heat energy in the gas is converted into mechanical energy. 
  • This mechanical energy is again converted into electrical energy by using the generator

Compressor:

  • The air compressor used in gas turbines is of rotary type mainly axial flow turbines. 
  • It draws air from the atmosphere and compressed to the required pressure.
  • Around 60% of total work output of gas turbine is used by compressor and remaining is converted into electrical energy.

Compressors can be of two types:

  1. Positive displacement type Compressor:
    • Positive displacement type like reciprocating compressors, Root's blower, and vane - sealed machines.
  2. Rotary type Compressor:
    • Rotary type like centrifugal and axial flow compressor.
  • The principal type of compressor used nowadays, in the majority of the gas turbine power plants are especially in aircraft applications, is the axial flow compressor.

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