Question

TURBINE IMPULSE - PELTON WHEEL

QUESTION 1:

The nozzles of a 4-jet Pelton wheel turbine, each have a diameter of 125 mm and the velocity of each water jet is 96 m/s. The available head at the nozzles is 500 m. The blade velocity is 46% of the jet velocity. The turbine has a hydraulic efficiency of 85% (i.e. nozzles included). The friction across the buckets is 6% from entry to exit.

Sketch the vector diagram showing all details. Calculate:

1. The flow rate through the turbine. ANS: +/- 4.712 m3/s

2. The nozzle velocity coefficient.   ANS: +/- 0.969

3. The bucket outlet angle.   ANS: +/- 29.115˚

Answer 1