Compressors, Gas Turbines and Jet Engines
The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the

Total temperature drop in the stage
Total adiabatic temperature drop
Adiabatic temperature drop in the stage
Total temperature drop

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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

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

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Gauge discharge pressure to the gauge intake pressure
Stroke volume and clearance volume
Absolute discharge pressure to the absolute intake pressure
Pressures at discharge and suction corresponding to same temperature

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