Hydraulic design of giant-scale Francis turbine in Xiluodu hydropower plant
Wang Zhaoning1,2, Guo Pengcheng1, Luo Xingqi1, Wang Yalin2
1.School of Hydropower Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China; 2.Dongfang Electric Machinery Co., Ltd., Deyang, Sichuan 618000, China
Abstract:According to high water head, large head variation and 770 MW unit capacity, a study of hydraulic design of the giant Francis turbine units in the Xiluodu hydropower plant was carried out. From the view of hydraulic stability control, the hydraulic design condition was discussed. The selecting principle and matching relationship of four key hydraulic parameters including rated speed, unit discharge, unit speed, design head as well as two important geometric parameters covering guide vane relative height and diameter ratio of the runner inlet and outlet, were demonstrated. The possible stability problems induced by different hydraulic design parameters were analyzed by comparing different preliminary design schemes, and the viewpoint of selecting low hydraulic design parameters in developing giant Francis turbine was emphasized. The results show that increasing design head can improve the vortex flow characteristics in the runner channel at the high head part load operating region, and can make the incipient cavitation at the suction surface of the blade inlet side far away from the operation region of the hydraulic turbine. Finally, it has been proved that the hydraulic design adopted has practical engineering values by the model acceptance test.
王钊宁,, 郭鹏程, 罗兴锜, 王亚林. 溪洛渡水电站巨型混流式水轮机水力开发[J]. 排灌机械工程学报, 2013, 31(8): 681-687.
Wang Zhaoning,, Guo Pengcheng, Luo Xingqi, Wang Yalin. Hydraulic design of giant-scale Francis turbine in Xiluodu hydropower plant. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(8): 681-687.
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