弯段溢洪道导流墩联合糙条模型试验研究

Study on Model Test of Diversion Pier Combined with Rough⁃Strip in the Bend Spillway

为了研究弯段溢洪道中水流运动规律,建立了径宽比R/B为1.75的60°弯段溢洪道试验模型,通过改变导流墩联合糙条辅助消能工的布置参数,对实测数据进行分析,结果表明:导流墩联合糙条辅助消能工对水流有显著导流效果,可使水面横比降有效降低,使水面结构改善;长宽比L/B=0.187 5时水力条件优于L/B=0.125 0的,其最大消能率可达60%,水流动力轴线在弯道段,由凸岸向溢洪道中轴线靠近且出现不同幅度波动的趋势,在出口段,由凹岸一定程度向溢洪道中轴线迁移,大大缩短了纵向流速分布的调整距离。在弯道内合理地布置联合消能工既节省工程投资,又符合溢洪道水力特性要求。

In order to study the characteristics of water flow movement in the spillway of curved section,this paper established a 60°bend spillway test model with a R/B of 1.75 and analyzed the measured data by changing the diversion pier combined with brown strip auxiliary en⁃ergy dissipation of the layout parameters.The results show that the diversion pier combined with the Brown strip auxiliary energy dissipation works has significant diversion effect on water flow,can effectively reduce the horizontal gradient of water surface and effectively improve the water surface structure;when L/B=0.1875,the hydraulic condition is better than L/B=0.125,the maximum energy dissipation rate can reach to 60%,the flow of power axis in the bend section,from the convex shore to the spillway axis near and appear different amplitude fluc⁃tuation trend,in the outlet section,from the concave bank to a certain degree of the middle axis of the spillway migration,which greatly shortens the longitudinal velocity distribution of the adjustment distance.It can not only save the project cost,but also meet the hydraulic characteristics of the spillway and provide theoretical reference for the actual engineering design.