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《Advances in Science and Technology of Water Resources》 2011-02
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Optimization tests on energy dissipator of diversion and deep flood discharge Tunnel of Xiaoshixia Hydropower Station

LI Lin1,2,LU Ke-eng3,QIU Xiu-yun1,2,ZHAO Tao1,2,MU Zhen-wei1,2,HOU Jie1,2(1.College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;2.Agricultural and Water Saving Research Centre,Xinjiang Agricultural University,Urumqi 830052,China;3.Reconnaissance and Design and Research Institute of Water Conservancy and Hydropower,Urumqi 830000,China)  
Based on the model tests on the original design scheme for the diversion and deep flood discharge tunnel of Xiaoshixia Hydropower Station on Kumalake River in Xinjiang Uygur Autonomous Region,the submerged hydraulic jump was generated in the stilling pool of the diversion tunnel,and the hydraulic jump superimposed with the jet flows from the floodgate at the steep gradient section,resulting in violent fluctuation of water flows.In order to prevent the apron slab from vibrating and being destroyed by great hydrodynamic load,a suspended grid dissipator was employed,whose installation method was different from that of the traditional one.The suspended grids were installed from the end of the steep slope section and the installation height increased with the length of hydraulic jump,and thus a stair type was formed.The tests show that the suspended grids break up the surface circumflex vortex and increase the backflow resistance,make the hydraulic jump move toward the lower part of the stilling pool,and a little submerged hydraulic jump is thus generated.The fluctuating intensity of water flows at the steep section and in the stilling basin obviously decreases,and splash height is much lower than that before installing suspended grids.The proposed arrangement of suspended grids will be useful for similar projects.
【Fund】: 新疆水利水电工程重点科学基金(XJWH20100389)
【CateGory Index】: TV653
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