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If diffusers fitted at the outlet of axial-flow compressors can be designed to have an actual pressure-rise coefficient Cprof 0.6(the actual static-pressure rise divided by the actual dynamic head at inlet), calculate the compressor stagnation-to-static polytropic efficiency and pressure ratio to the end of the diffuser for two alternative compressor designs. Both have a stagnation-to-stagnation polytropic efficiency of 0.9and a pressure ratio of 10:1to the end of the compressor blading (i.e., to the diffuser entrance). The diffuser-entrance Mach numbers are different for the two designs: 0.2in one case and 0.4in the other. The compressor-inlet stagnation conditions are 285Kand 100,000Pa. A common mean Cp

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/Rof 3.55may be used.