5. An inflow to a turbine with a discharge of 20 m3/s leads to a ration speed of 150 rpm. The blades inlet edges have an

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5 An Inflow To A Turbine With A Discharge Of 20 M3 S Leads To A Ration Speed Of 150 Rpm The Blades Inlet Edges Have An 1 (320.61 KiB) Viewed 12 times

5. An inflow to a turbine with a discharge of 20 m3/s leads to a ration speed of 150 rpm. The blades inlet edges have an angle of 120° to the direction of whirl. The outer diameter of the runner is 1.5 m and the runner inlet width is 1.0 m. (a) To plot the velocity triangle at the blade outlet edge. (3 marks) (b) Assume design operating conditions and no velocity of whirl at outlet, calculate the power delivered by the runner. (6 marks) (c) The elevation difference between the head race and the tail race is 23 m and the head available to the turbine is 20 m, what is the hydraulic efficiency of the turbine and overall efficiency? (5 marks) (d) If a model of 1/10 full scale is constructed to operate under a head of 10 m, what must be its speed, power, water consumption and overall efficiency to run under the similar conditions to the prototype? (6 marks)