Compressors, Gas Turbines and Jet Engines
In the axial flow gas turbine, the work ratio is the ratio of

Actual compressor work and theoretical compressor work
Compressor work and turbine work
Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
Output and input

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Compressors, Gas Turbines and Jet Engines
If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

D₁/D₂ = (p₃/p₁)1/4
D₁/D₂ = (p₁/p₃)1/4
D₁/D₂ = (p₁ p₃)1/4
D₁/D₂ = (p₁ p₃)1/2

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Compressors, Gas Turbines and Jet Engines
Intercooling in gas turbines

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

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