An analysis is presented to give a qualitative picture of the oper¬ation, of each stage in a high-pressure-ratio multistage compressor over a full range of operating flows and speeds and to point out methods of improving off-design performance. The analysis used is based on single-stage performance results that have been "stacked" to form a multistage compressor in which the design or match point of each stage has been arbitrarily selected. Stage interaction effects and changes of stage efficiency with rotor speed are neglected in this method and the tem¬perature rise across each stage is assumed to vary directly as the blade speed squared.
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