KYD水库底孔泄洪洞平底渐扩式消力池优化试验

摘要

Through the test of design scheme for the gradually expanding flat⁃bottom stilling basin deep flood discharge tunnel of KYD Reservoir in Green River county in Xinjiang, it is found that length, depth and sidewall height can not meet the security requirements. The design scheme shows that:the length of stilling basin basically meets the requirements of the stilling basin with the divergent angle of 1.37°,when estimates according to stilling ba⁃sin which is equal width and rectangle, but estimated error is large. The formula of conjugate depth of gradually ex⁃panding stilling basin was combined with the empirical formula of width of gradually expanding stilling basin to cal⁃culate the width directly. Suspended grid energy dissipater was used to decrease intense pulsating water and se⁃quent depth. The results show that the surface eddies which caused by upper water jump intense cyclotron motion are broken with the increase of submergence degree. What is more, the maximum depth in stilling basin decreases by 1 m. Flow pulsation reduces significantly, and the height of waves splashing is significantly less than before.%通过新疆青河县KYD水库底孔泄洪洞平底渐扩式消力池设计方案的试验，发现消力池池深、池长、边墙高远不能满足安全泄流要求。优化方案试验结果表明，对于渐扩角1.37°的渐扩式消力池按等宽度矩形消力池估算时池长基本满足要求，但是池深估算误差较大。联立溢洪道设计规范中的渐扩式消力池共轭水深计算公式和渐扩式消力池池深经验公式可较准确地计算池深。为了减小跃后水流剧烈脉动，降低跃后水深，采用了悬栅式消能工。试验结果表明，水跃淹没度增大，悬栅起到了破碎栅条上部水跃剧烈回旋运动引起的表面漩滚，消力池内水深降低，最大水深减小1.0 m，陡坡段和消力内水流脉动明显减弱，浪花溅起高度明显小于加悬栅前。