Compressors, Gas Turbines and Jet Engines
Volumetric efficiency is

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

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Compressors, Gas Turbines and Jet Engines
In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by

W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)
W₁/W₂ = n₁/n₂
W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)
W₁/W₂ = n₂/n₁

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