Compressors, Gas Turbines and Jet Engines
The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Rotor to static enthalpy rise in the stator
Stator to static enthalpy rise in the rotor
Stator to static enthalpy rise in the stage
Rotor to static enthalpy rise in the stage

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Compressors, Gas Turbines and Jet Engines
For minimum work in multistage compression, assuming same index of compression in all stages

Work done in subsequent stages should decrease
Work done in subsequent stages should increase
Work done in first stage should be more
Work done in all stages should be equal

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