Compressors, Gas Turbines and Jet Engines
For minimum work required to compress and deliver a quantity of air by multistage compression

The compression ratio in each stage should be same
All of the listed here
The intercooling should be perfect
The work-done in each stage should be same

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Gauge discharge pressure to the gauge intake pressure
Stroke volume and clearance volume
Pressures at discharge and suction corresponding to same temperature
Absolute discharge pressure to the absolute intake pressure

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Compressors, Gas Turbines and Jet Engines
In the axial flow gas turbine, the work ratio is the ratio of

Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
Compressor work and turbine work
Output and input
Actual compressor work and theoretical compressor work

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