Compressors, Gas Turbines and Jet Engines
Rotary compressors are used for delivering

Small quantities of air at high pressures
Small quantities of air at low pressures
Large quantities of air at high pressures
Large quantities of air at low pressures

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Compressors, Gas Turbines and Jet Engines
For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by

p₂ = (p₁ + p₃)/2
P₂ = Pa × p₃/p₁
p₂ = Pa p₃/p₁
p₂ = p₁. p₃

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