In: Mechanical Engineering
Estimate the number for stages required for the turbine which is a multi-stage axial turbine designed with impulse stages and operating with an inlet pressure and temperature of 6 bar and 900 K and outlet pressure of 1 bar.
The isentropic efficiency of the turbine is 85 %.
All the stages are to have a nozzle outlet angle of 75 degrees and equal inlet and outlet rotor blade angles.
Mean blade speed is 250 m/s and the axial velocity is 150 m/s and is a constant across the turbine.