Effect of Discharge Coefficient on Performance of Multi Jet Pelton Turbine Model

Abstract: The conversion of hydraulic energy into mechanical energy takes place in hydraulic turbines. Further this energy is converted to electrical energy with the help of generators and then supplied to consumer. With increasing demand, efficiency of every machine plays vital role. When water is stored at very high head, hydraulic energy can be converted efficiently into mechanical energy with the help of Pelton turbine. The performance of Pelton turbine at designed and off-design points is important. Performance of turbo-machines is generally evaluated before installation with the help of model testing at designed and off design regimes. Now-a-days with advanced computers and numerical techniques, Computational Fluid Dynamics (CFD) has emerged as boon for optimisation of turbo-machines. In present work, performance analysis of existing six jet Pelton turbine at design and off design discharge has been numerically carried out using Ansys-CFX. The efficiency results are compared with available model test result and found to have close comparison. The variation in pressure distribution, water velocity and water distribution have also been obtained and discussed