Compressors, Gas Turbines and Jet Engines
Volumetric efficiency is

The ratio of stroke volume to clearance volume
Index of compressor performance
The ratio of the air actually delivered to the amount of piston displacement
Reciprocal of compression ratio

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor with clearance volume

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

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