渐扩式消力池体型优化研究

Research on the Optimization of Gradual Expanding Stilling Basin

在俄垤水库的水工模型试验中发现其渐扩式消力池内发生远驱式水跃,流态较差,无法满足消能防冲要求。为解决此问题,采用数值分析软件FLOW-3D探究了渐扩式消力池体型参数变化对池内流态、淹没度、消能率等的影响变化规律,结果表明:对于发生远驱式水跃的渐扩式消力池,增加尾坎高度可以显著提高淹没度,选择合适的尾坎高度不仅能改善池内流态还可将水跃消能率控制在合理范围内;增大扩散角和池长,对淹没度和消能率影响较小且于改善流态无益。根据结果推荐了合理的体型方案并通过物理模型验证。

In the hydraulic model test of Edie reservoir,it was found that the repelled downstream hydraulic jump occurred in the gradual expanding stilling basin,and the flow state was poor,which could not meet the requirements of energy dissipation and scouring prevention.In order to solve this problem,numerical analysis software FLOW-3D was used to explore the influence of the body type parameters of the gradual expanding stilling basin on the flow state,inundation degree,energy dissipation rate and so on in the stilling basin,The results show that:for the gradual expanding stilling basin with the repelled downstream hydraulic jump,increasing the height of the tail can significantly improve the inundation degree,the appropriate height of the tail sill can not only improve the flow state in the stilling basin,but also control the energy dissipation rate to a reasonable range;the increase of diffusion angle and pool length has little effect on the inundation degree and energy dissipation rate and is not beneficial to improving the flow state.Based on the results,a reasonable shape parameters was recommended and verified by physical model.The research results can provide a reference for design optimization in the same type of engineering.