Linetype optimization and experiment on volute outlet passage in large pumping stations
Li Yanjun1,Yan Dengfeng2,Yan Hongqin3,Hu Deyi4,Feng Xusong5
(1.Technical and Research Center of Fluid Machinery Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;2.Yangzhou University,Yangzhou,Jiangsu 225009,China;3.Hydraulic Engineering Science and Technology Consultation Limited Company of Jiangsu Province,Nanjing,Jiangsu 210029,China;4.Shanghai Investigation,Design and Research Institute,Shanghai 200434,China;5.Jiangsu Water Supply Co Ltd,for East Route of South-to-North Water Diversion,Nanjing,Jiangsu 210029,China)
After optimum hydraulic design and model test with series of schemes,the major geometrical parameters with excellent hydraulic performances are obtained for the outlet volute passages of large pumping stations.The guide-water cone was optimized by hydraulic design,and the radius of the volute curvature was increased while the width of the outlet passages was not changed and the length of expansive channel was lengthened.With the ratio(10.27) of prototype and model,blade angle(-2°) and speed(1 400 r/min) remained unchanged,the highest efficiency of pump sets with the volute passage is over 78%,which has increased by 6% than before and has exceeded the level of vertical pump set with the commonly used structural types of inlet and outlet passages.
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