The first stage of a turbine is a two-row velocity compounded impulse wheel. The steam velocity at inlet is 600 m/s and the mean blade speed is 120 m/s. The nozzle angle is 16° and the exit angles for...

The first stage of a turbine is a two-row velocity compounded impulse wheel. The steam velocity at inlet is 600 m/s and the mean blade speed is 120 m/s. The nozzle angle is 16° and the exit angles for the first row of moving blades, the fixed blades, and the second row of moving blades are 18°, 21° and 35°, respectively. Calculate (a) the blade inlet angles for each row, (b) the driving force for each row of moving blades and axial thrust on the wheel for a mass flow rate of 1 kg/s, (c) the diagram efficiency and diagram power for the wheel per kg/s steam, and (d) the maximum possible diagram efficiency. Assume blade velocity coefficient as 0.9 for all blades.