Compressors, Gas Turbines and Jet Engines
Surging is the phenomenon of

Air stream not able to follow the blade contour
Air stream blocking the passage
Unsteady, periodic and reversed flow
Motion of air at sonic velocity

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

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