西淝河闸站工程开孔导流墩整流试验研究

Experimental research on opening diversion piers at Xifeihe combined sluice-pump station

针对西淝河闸站工程在闸、站单独运行时存在的回旋和斜流问题,采用整体正态模型对闸站工程进行水工模型试验研究。在抽排水工况下,设计了不同导流墩长度,不同导流墩开孔尺寸包括开孔宽度、开孔间距、开孔高度等7种导流墩整流方案;其中对仅25 m长导流墩方案和导流墩最优开孔尺寸方案进行了自排工况下自排闸的过流流态及流速分布研究。通过对比各方案下导流墩侧回旋区面积大小及各孔流速均匀度,建议导流墩长25 m,开孔宽4. 5 m,相邻的孔口间距6. 25 m,开孔高度5 m。5#和6#流道中间加设1 m短隔墩的方案可减小泵站前池及闸前水流回旋区域,改善水流流态,提高各孔流速均匀度,为泵站机组及水闸运行提供良好的水力条件。试验研究结果可为闸站结合工程选择导流墩整流方案提供技术参考。

In view of the problems of raceway and diagonal flow(whirling flow and skew flow)during the operation of the Xifeihe combined sluice-pump station alone,the hydraulic model tests on the combined sluice-pump junction are carried out by use of the integral normal model.Under the working conditions of drainage,seven kinds of rectification schemes of the diversion pier are designed,such as different lengths of the diversion pier,opening size of different diversion piers,spacing between openings and the height of openings.And only the25m long diversion pier scheme and the optimal opening size of the diversion piers are studied under the working conditions of selfdrainage and velocity distribution.By comparing the size of the raceway area beside the diversion piers and the velocity uniformity of each opening,the model tests show that the length of the diversion pier is25m,the opening width is4.5m,the distance between the adjacent opening spacings is6.25m,and the opening height is5m.The scheme of adding a1m short diversion pier between the5#and6#channels can reduce the water swirling area in the forebay of the pumping station and the front of the sluice,so as to improve the flow pattern of the water flow,increase the velocity uniformity of each opening,and provide good hydraulic conditions for the operation of the combined sluice-pump station.The experimental research results can provide technical references for the selection of the rectification scheme of the diversion piers in combination of the sluice with the pumping stations.