Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

U < Vo
V = Uo
Vt > Vo
Vi = Vo

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

May increase/decrease depending on compressor capacity
Is not dependent upon compression ratio
Increases with increase in 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 adiabatic h.p.
Work to compress air isothermally to work for actual compression
Power to drive compressor to isothermal h.p.
Isothermal h.p. to the BHP of motor

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