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

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

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

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

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