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

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

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

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