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

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

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