A three jet Pelton turbine is required to generate 10000 kW under a net head of 400 m. The blade angle at the outlet 15° and the decrease in the relative velocity while passing over the blade is 5%. Determine,
(i) The diameter of the jet
(ii) The force exerted by a jet on the buckets.
Given,
Overall efficiency of turbine = 80%
Co-efficient of velocity = 0.98%
Speed ratio = 0.46
Further, if the jet ratio is not to be less than 10, calculate
(a) speed of the wheel for a frequency of 50 hertz/sec.
(b) corresponding wheel diameter.