Compressors, Gas Turbines and Jet Engines
If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Dia. of L.P. cylinder, and D₂ = Dia. of H.P. cylinder)

D₁/D₂ = p₂/p₁
D₁/D₂ = p₁/p₂
None of these
D₁/D₂ = p₁ p₂

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Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Exhaust gases drive the compressor
Heated
Bled gas from turbine is heated and readmitted for complete expansion
Compressed air before entering the combustion chamber is heated

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Compressors, Gas Turbines and Jet Engines
Intercooling in gas turbines

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

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