Compressors, Gas Turbines and Jet Engines
Inter-cooling in multistage compressors is done

To enable compression in two stages
To cool the air during compression
To cool the air at delivery
To minimize the work of compression

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

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

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