Metrics of Pelton Wheel and Reaction Turbine Assignment

Assignment Task

• A twin jet Pelton wheel has a mean runner diameter of 1.68 m & runs at 500rpm, each jet is of dia. 152 mm. The net head is 510 m. Bucket turns the jet through 1650 & relative velocity is reduced by 12% when it flows over the bucket. Windage & mechanical losses are 3% of the water power supplied. Nozzle co-efficient = 0.98. Find:

1. Water power supplied.
2. Brake power.
3. Force of each jet on bucket.
4. Overall efficiency. 

• Following data relate to an inward flow reaction turbine with radial discharge: Power = 400kW, Speed= 900rpm, Head available= 70m, Hydraulic efficiency= 95%, Flow ratio= 0.18, Width to diameter ratio at inlet= 0.11, ratio of inlet to outlet diameter= 2. Determine the dimensions of turbine and degree of reaction. Assume, constant velocity of flow

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