Compressors, Gas Turbines and Jet Engines
Rotary compressor is best suited for

Small quantity of air at high pressure
Large quantity of air at low pressure
Large quantity of air at high pressure
Small quantity of air at low pressure

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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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