An axial flow compressor compresses the air up to overall stagnation pressure 10 bars with overall stagnation isentropic efficiency of 88%. The inlet stagnation pressure and temperature are 1 bar and 300 K. The mean blade speed is 200 m/s. The degree of reaction is 0.5 at the mean radius with air angles of 300 and 100 at rotor inlet and outlet with axial direction respectively. The work done factor is 0.88. The hub-tip ratio is 0.4. The mass flow rate is 50 kg/s. Work out the following. 30
- Draw the inlet and outlet velocity triangles and show the compression process on T-S diagram
- The stagnation polytropic efficiency
- The number of stages
- The blade height in first stage of the compressor