Compressors, Gas Turbines and Jet Engines
In the axial flow gas turbine, the work ratio is the ratio of

Compressor work and turbine work
Actual compressor work and theoretical compressor work
Output and input
Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet

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

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