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

To accommodate Valves in the cylinder head
To provide cushioning effect
To attain high volumetric efficiency
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
Volumetric efficiency of a compressor with clearance volume

May increase/decrease depending on compressor capacity
Decreases with increase in compression ratio
Increases with increase in compression ratio
In not dependent upon compression ratio

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