Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Stroke volume and clearance volume
Pressures at discharge and suction corresponding to same temperature
Absolute discharge pressure to the absolute intake pressure
Gauge discharge pressure to the gauge intake pressure

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Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

Two adiabatic, one isobaric and one constant volume
Two adiabatic and two isobaric
One adiabatic, two isobaric, and one constant volume
One adiabatic, one isobaric and two constant volumes

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