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

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

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