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

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Compressors, Gas Turbines and Jet Engines
The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Rotor to static enthalpy rise in the stage
Stator to static enthalpy rise in the stage
Stator to static enthalpy rise in the rotor
Rotor to static enthalpy rise in the stator

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