Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor without clearance volume

Increases with increase in compression ratio
Is not dependent upon compression ratio
May increase/decrease depending on compressor capacity
Decreases with increase in compression ratio

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Work to compress air isothermally to work for actual compression
Power to drive compressor to isothermal h.p.
Isothermal h.p. to adiabatic h.p.
Isothermal h.p. to the BHP of motor

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