水石门水电站溢流表孔挑流消能数值模拟

Numerical Simulation of Overflow Surface Outlet Ski-jump Energy Dissipation of Shuishimen Hydropower Station

为研究水石门水电站溢流堰挑流消能问题,采用有限体积法,利用VOF追踪自由液面和RNGκ-ε紊流模型建立了溢流堰挑流消能的三维数值模型,经与模型试验结果验证,吻合较好。根据工程实际情况,拟定了多种优化消能方案并进行了数值模拟计算。结果表明,在原方案基础上适当增大挑流反弧半径,优化鼻坎挑角能分散水舌入水冲击能量,改善泄流消能作用,从而有效降低下游河床的冲刷。

For the study problem of overflow weir ski-jump energy dissipation of Shuishimen hydropower station,based on finite volume method,the VOF tracking free surface and RNGκ-εturbulent model are used to establish three-dimensional numerical model of overflow weir ski-jump energy dissipation.As compared with the experimental results,it is well coincided with the model test.According to the practical situation,a various of energy dissipation scheme and the corresponding numerical simulation were carried out.The results show that when appropriate increase pick flow arc radius and reduction angle of flip bucket on the basis of the original plan can optimize the impact energy of jet nappe,improve the discharge and energy dissipation and reduce the downstream river bed scour effectively.