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

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

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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

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

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