Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

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

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

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

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