Compressors, Gas Turbines and Jet Engines
Pressure ratio in gas turbines is the ratio of

Inlet pressure to exhaust pressure
Highest pressure to exhaust pressure
Compressor pressure ratio
Pressures across the turbine

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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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