水垫塘底板冲击压强和流速分布研究

Investigation of impact pressure and velocity distributions on the stilling basin

雅砻江干流梯级水电站大坝具有高水头、大流量、河谷狭窄的特点,消能问题突出。研究选定水垫塘内流态、底板冲击压强作为优化指标,通过改变坝身孔口尺寸、二道坝高程等手段,达到在控制水垫塘底板冲击压强的同时,使得在各种工况下泄洪水股纵向拉开、横向归槽并避免对下游河道的冲刷。

The energy dissipation problems are severe to huiht hydropower stations on the Yalong River, as it has high water head and large discharge rate, and mountain valley is narrow. Based on the impact pressure and the velocity distributions on the stilling basin, the shape optimizations of the outlets in the dam are made by changing the sizes of the outlets and the elevation of the second dam. This results in that the impact pressure values on the stilling basin can be reduced, and the tr ojactoryes nf the water jets from the outlets can be controlled both in longitudinal and horizontal directions, the river bed erosion can also avoided.