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

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Compressors, Gas Turbines and Jet Engines
Clearance volume in actual reciprocating compressors is essential

To provide cushioning effect
To accommodate Valves in the cylinder head
To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
To attain high volumetric efficiency

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