Compressors, Gas Turbines and Jet Engines
Free air is the air at

15°C and 1 kg/cm²
20°C and 1 kg/cm² and relative humidity of 36%
0°C and standard atmospheric conditions
Atmospheric conditions at any specific location

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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
In not dependent upon compression ratio
Decreases with increase in compression ratio
Increases with increase in compression ratio

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