Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Heated
Bled gas from turbine is heated and readmitted for complete expansion
Compressed air before entering the combustion chamber is heated
Exhaust gases drive the compressor

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

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

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