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

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

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Compressors, Gas Turbines and Jet Engines
Intercooling in gas turbines

Increases net output and thermal efficiency both
Decreases net output and thermal efficiency both
Increases net output but decreases thermal efficiency
Decreases net output but increases thermal efficiency

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