倾斜底板角度对侧向挑入消力池的岸边溢洪道的影响

Impact of Inclined Bottom Angle on Bank Spillway Laterally Jetting into Stilling Basin

针对岸边溢洪道从侧面挑入与之平行布置的已有消力池来消能的布置形式,采用数值模拟方法研究了不同倾斜底板角度及挑坎与消力池间高差的溢洪道水力特性及消力池内的水流流态等。结果表明,随着挑坎底板倾角的逐渐增大,水舌左支流量逐渐减小,右支流量逐渐增大,挑坎所受最大压强与挑坎内最大水深均逐渐减小;消力池底板最大压强逐渐增大,但最大冲击点位置逐渐向消力池右侧及上游区域移动,即消力池左侧边墙与尾坎逐渐不受冲。

An layout of side spillway was studied in this article,which could make the water lateral scatter into existing parallel arranged stilling basin to achieve energy dissipation.Numerical simulation was used to make a deep research on the spillway with different angles of inclined bottom and altitude difference between horizontal bottom of bucket and stilling basin bottom,including the analysis of hydraulic characteristics of spillway and flow regime in stilling basin.The results show that with the angle increasing of inclined bottom,the discharge of left branch of jet nappe decreases and the right branch is just exact opposite,and the maximum pressure and water depth on the flip bucket are both have a general downward trend.The maximum pressure on stilling basin bottom increases gradually,while the position of maximum impact point moves towards right side and upstream region of the stilling basin simultaneously,which means less impaction to left sidewall and tail weir of stilling basin.