International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-9 Issue-1, November 2019 2418 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number: A4408119119/2019©BEIESP DOI: 10.35940/ijitee.A4408.119119 Abstract: Hydro turbine machineries erosion due to silt is a complex issue for the effective practice of hydropower plants. Erosion caused by silt of the Pelton turbine buckets is a compound phenomenon that depends on size of silt particles , silt particles concentration , velocity of jet , and working time . This paper deals with the influence of silt erosion for various silt loaded factors and effective parameters. The preference selection index (PSI) and technique for order of preference by similarity to ideal solution (TOPSIS) approaches has been adopted to find optimal set of parameters which offers the highest performance for the Pelton turbine. Based up on the results obtained from both PSI and TOPSIS approaches it is found that optimal performance has been provided by A-1 alternate with geometric and flow parameters as , , and respectively. Keywords: Hydro energy, silt size, Pelton turbine, PSI, TOPSIS Nomenclature Length of the weir crest (perpendicular to flow) Effective width, Coefficient of discharge Concentration of silt particles, Acceleration due to gravity, Measured upstream head over the weir, Effective head, Net head, Width correction factor Head correction factor Velocity coefficient (= as losses are considered in the nozzle) Pressure Discharge, Size of silt particles, microns (μ) Working time, Jet velocity in Velocity of jet, Greek symbol Density of water Revised Manuscript Received on November 05, 2019. Robin Thakur*, School of Mechanical & Civil Engineering, Shoolini University, Solan, India. Email: robinthakur@shooliniuniversity.com Sunil Kumar, School of Computer- Science & Electrical Engineering Shoolini University, Solan, India. -. Email: sunilthakur@shooliniuniversity.com Kamal Kashyap, School of Mechanical & Civil Engineering, Shoolini University, Solan, India. Email: kamal.maximus23@gmail.com Ashwani Sharma, School of Computer- Science & Electrical Engineering Shoolini University, Solan, India. -. Email: ashwanisharma@shooliniuniversity.com Sorabh Aggarwal, School of Mechanical & Civil Engineering, Shoolini University, Solan, India. Email: sorabh.btech11@gmail.com I. INTRODUCTION Hydropower plants are the most progressive and established renewable energy technology and provides some level of power generation in more than 160 countries globally. Power generated from hydro has very slight environmental and social impact if we will compare it to other renewable energy resources by Singh and Singhal [1] and Robb [2]. Hydropower is the main renewable electrical energy source at universal level and contributes to sustainable progress. Hydropower is able to supply clean and reasonable energy in its most valuable form, electricity. Hydro turbine is suppose to be primary segment of a hydro control plant but regrettably, hydro turbines experience issues like sediment ersion which declines the proficiency over a time of their functioning life. Residue erosion occurence in hydro turbine is real issue ,as it effects the smooth functioning of hydropower plants by Bansal et al. [3] and Pundir and Kumar [4]. Several experimental and analytical investigations for the deteriorated efficiency and performance of the hydro turbines due to silt erosion have been suggested and discussed by various investigators. Woodcock and White [5] studied the basics of a Pelton turbine, single-wheel development and close running clearances absence makes it more appropriate for applications. Their outcomes showed that the Pelton turbines have been employed for a long time in high-head hydroelectric power plants and high water powered production. Chattopadhyay [6] did observation of runners from different water samples of different rivers having high silt content and observe that the wear occurred is unusual in the runners of the turbine. Their conclusions are described against microstructure, hardness and work-hardening rate based on the various wear rates of the alloys. Mann [7] examined the matter of erosion in various hydel power locations situated in Himalayan area. Mann & Arya [8] stated the abrasion and silt erosion features of HVOF coatings and plasma nitriding beside with usually used steels in hydel turbines. Their outcomes show that the HVOF tungsten carbide on steel seems, by all accounts, to be an outstanding disintegration protection shield to battle with low and high-energy molecule impingement wear. Desale, Gandhi, & Jain [9] analyzed the influence of erodent properties on slurry erosion. The investigation shows that with the reduction in the shape factor, there is a rise in wear and in the density. Bajracharya et al. [10] investigated that erosion of hydro turbine machineries is one of the complex trouble especially in monsoon season through silt in the Himalayan region. Chauhan et Selection of Erosive Wear Rate Parameters of Pelton Turbine Buckets using PSI and TOPSIS Techniques Robin Thakur, Sunil Kumar, Kamal Kashyap, Ashwani Kumar, Sorabh Aggarwal