A propeller turbine has been designed to develop 22 MW under a head of 20 m whilst running at 150 rpm. The other relevant data are overall efficiency = 88.3%, hydraulic efficiency = 95.2%, outer...

A propeller turbine has been designed to develop 22 MW under a head of 20 m whilst running at 150 rpm. The other relevant data are overall efficiency = 88.3%, hydraulic efficiency = 95.2%, outer diameter of runner = 5 m, diameter of the hub = 2.5 m. If the turbine discharges without whirl at exit, then determine the runner vane angles at the hub and at the outer periphery. Also determine the specific speed of the turbine.