燕尾坎在忠玉水电站高拱坝表孔上应用研究  

Application of partial-flip bucket on overfall spillways of the high arch dam of Zhongyu Hydropower Station

作　　者：钟杰[1] 张法星[1] 甄燕[2] 李山茂 ZHONG Jie;ZHANG Faxing;ZHEN Yan;LI Shanmao(State Key Laboratory of Hydraulics and Mountain River Development and Protection,Sichuan University,Chengdu 610065,Sichuan,China;Power China Northwest Survey&Design Institute Co.,Ltd.,Xi’an 710065,Shaanxi,China)

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《水利水电技术（中英文）》2023年第S02期268-274,共7页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(52192673)。

摘　　要：为了探究燕尾坎是否可应用于高拱坝表孔,采用1∶80整体水工模型和三维湍流数值计算方法对燕尾坎在忠玉水电站高拱坝表孔上的适用性问题开展了研究,获得了典型工况下燕尾坎挑流水舌形态,并对比了常规连续挑坎与燕尾坎挑坎内的水流形态和流速分布。来流条件相同时,下泄水流经过燕尾坎镂空开口时,在重力作用下铅直方向流速变大。燕尾坎挑坎出口断面水平方向流速值略小于常规挑坎,但铅直向下流速值是常规挑坎的3—5倍。水舌的最近挑距大幅减小,最远挑距略有减小,纵向长度变大,从而形成纵向拉伸水舌。忠玉水电站拱坝表孔采用燕尾坎挑流,可在纵向拉长水舌,避免集中入水;通过调整开口范围和宽度做到下泄流量沿入水范围均匀分布,从而大幅降低水垫塘冲击压强。In order to research whether partial-flip bucket can be applied to the overfall spillways of high arch dams,the applicability of partial-flip bucket on overfall spillways of the high arch dam of Zhongyu Hydropower Station was studied by using 1:80 global hydraulic model and three-dimensional turbulence numerical calculation method.The nappe shape of partial-flip bucket under typical working conditions was obtained,and the flow pattern and velocity distribution in the conventional flip bucket and the partial-flip bucket were compared.When the flow conditions are the same,the velocity increases in the direction of gravity under the action of gravity when the water flow passes through the air face of the partial-flip bucket.The horizontal and downstream velocity of the outlet section of the partial-flip bucket is slightly lower than that of the conventional flip bucket,but the vertical downward velocity is 3—5 times that of the conventional flip bucket outlet section.The latest trajectory distance of the nappe decreases greatly,the farthest trajectory distance decreases slightly,and the longitudinal length increases,thus forming the lengthwise stretch of the water tongue.The arch dam of Zhongyu Hydropower Station adopts partial-flip bucket to discharge,which can elongate the nappe lengthwise and avoid concentrated water inlet.By adjusting the opening range and width,the discharge can be evenly distributed along the inlet range,thus greatly reducing the impact pressure in plunge pool.

关 键 词：高拱坝 燕尾坎 挑流 冲击压强 水舌形态 

分 类 号：TV1[水利工程]