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
Total adiabatic temperature drop
Adiabatic temperature drop in the stage
Total temperature drop 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 all stages should be equal
Work done in first stage should be more
Work done in subsequent stages should decrease
Work done in subsequent stages should increase

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