Compressors, Gas Turbines and Jet Engines
Propulsive efficiency is defined as ratio of

Propulsive power and fuel input
Engine output and propulsive power
Thrust power and propulsive power
Thrust power and fuel energy

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

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