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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
If the flow of air through the compressor is perpendicular to its axis, then it is a

Centrifugal compressor
Turbo compressor
Reciprocating compressor
Axial flow compressor

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Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

r ɣ-1
1 - (1/r) ɣ-1/ɣ
1 - r ɣ-1
1 - (1/r) ɣ/ɣ-1

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Compressors, Gas Turbines and Jet Engines
A centrifugal compressor works on the principle of

Conversion of pressure energy into kinetic energy
Centripetal action
Conversion of kinetic energy into pressure energy
Generating pressure directly

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of air compressors is of the order of

60 - 70%
70 - 90%
40 - 50%
20 - 30%

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Compressors, Gas Turbines and Jet Engines
If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches

Isochoric
Adiabatic
Isentropic
Isothermal

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Compressors, Gas Turbines and Jet Engines
Gas turbine cycle with regenerator

Decreases heat loss is exhaust
Allows operation at very high altitudes
Increases thermal efficiency
Allows high compression ratio

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