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Q2. An axial flow compressor is required to deliver 50 kg/s of air at a stagnationpressure of 500 kPa. At inlet to the first stage the stagnation pressure is 100 kPaand the stagnation temperature is 23\deg C. The hub and tip diameters at thislocation are o.436 m and 0.728 m. At the mean radius, which is constant throughall stages of the compressor, the reaction is 0.5 and the absolute air angle atstator exit is 28.8\deg for all stages. The speed of the rotor is 8000 rpm. Determinethe number of stages needed assuming that the polytropic efficiency is 0.89 andthe axial velocity at the mean radius is constant through the stages and equal to167.1 m/s.

          Q2. An axial flow compressor is required to deliver 50 kg/s of air at a stagnationpressure of 500 kPa. At inlet to the first stage the stagnation pressure is 100 kPaand the stagnation temperature is 23\deg C. The hub and tip diameters at thislocation are o.436 m and 0.728 m. At the mean radius, which is constant throughall stages of the compressor, the reaction is 0.5 and the absolute air angle atstator exit is 28.8\deg  for all stages. The speed of the rotor is 8000 rpm. Determinethe number of stages needed assuming that the polytropic efficiency is 0.89 andthe axial velocity at the mean radius is constant through the stages and equal to167.1 m/s.

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