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

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

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Compressors, Gas Turbines and Jet Engines
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Exit nozzle, which is a constant volume process
Turbine blades, which is essentially an isentropic process
Exit nozzle, which is essentially an isentropic process
Turbine blades, which is a constant volume process

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