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A centrifugal compressor fitted with 21 radial vanes with an outside diameter of 40 cm is designed to operate at a rotational speed of 17,400 rpm. Assuming that the air admitted is at 101.3 kPa and a temperature of 15°C, determine
a. the absolute Mach number of the flow at the impeller tip given that the radial velocity at that location is 30 m/s;
b. the stagnation pressure of the air leaving the impeller if the total-to-total efficiency of the impeller is 92%;
c. the mass flow of air passing through the compressor if the axial width of the passage at impeller exit is 2.0 cm
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