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Numerical Investigations for Jet Flow Characteristics on Pelton Turbine Bucket

By Vishal Gupta and Dr. Vishnu Prasad


Abstract — In Pelton turbines, the jet of circular cross section is issued from nozzle and moves in air before striking the bucket. The bucket is divided into two symmetrical semiellipsoidal cups by sharp edge splitter. The jet strikes the bucket on the splitter. The splitter divides the jet into two equal sheets of water having free surface which moves on the curved path of bucket. The profile of curved path of bucket affects the force and also pressure and velocity distribution over bucket. Many investigators have worked for improvement of bucket profile for circular jet. The jet shape may also affect force, pressure and velocity distribution on bucket. Earlier, experimental techniques were used to predict the forces on bucket but it was difficult to get pressure and velocity distributions. Secondly, the experimental approach is time consuming as well as costly and needs special laboratory facilities. The development of CFD for multi phase free surface flow made it possible to investigate the fluid flow on Pelton turbine and also to visualize the flow pattern. The objective of this paper is compare the flow characteristics on Pelton bucket with circular and rectangular jet using numerical multi phase flow simulation. Numerical and theoretical results have been compared for typical bucket profile and bears closed comparison

Year: 2014
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