开孔导流墩几何参数对闸站工程前池整流效果的影响

Influence of Geometric Parameters of Perforated Diversion Pier on Flow-rectifying Effect in Forebay of Sluice-pump Station Project

为了改善闸站结合工程的泵站前池流态,采用计算流体力学(CFD)对闸站结合式泵站前池流态进行数值模拟,研究了开孔导流墩的长度、开孔宽度、相邻的孔口中心间距及开孔高度等因素对泵站前池流态的影响。结果表明:选择合适长度的导流墩能改善闸站结合工程的泵站流道进口的不良流态;在优选的长度下,进行导流墩不同开孔几何参数的对比计算,发现开孔导流墩长度为8.62D(D为水泵叶轮的直径)、开孔宽度为1.55D、相邻的孔口中心间距为2.16D、开孔高度为0.66h(h为前池水深)时,相比于其他几何参数的开孔导流墩,前池内流态能得到更好的改善,水泵入口流速分布更均匀,漩涡综合影响函数更低; CFD计算结果与模型试验结果基本吻合,研究成果可为闸站结合工程选择合适的导流墩提供参考。

The flow field in the forebay of sluice-pump station combination project is simulated via computational fluid dynamics(CFD)to investigate the influences of geometric parameters of perforated diversion pier,including pier length,orifice width,distance between the center of adjacent two orifices,and the height of the opening,on the flow pattern in the forebay.Results suggest that an appropriate length of the diversion pier could improve the flow pattern at the inlet of the pumping station.At a preferred length together with the following conditions(length of diversion pier:8.62 D(D represents the diameter of water pump impleller);orifice width:1.55 D;distance between the center of adjacent two orifices:2.16 D;height of opening:0.66 h(h stands for the water depth of the forebay)),the flow pattern in the forebay is improved better than that under other geometrical parameters,the flow velocity distribution at the inlet is more uniform,and the whirlpool combined effect function becomes lower.CFD calculation results are in agreement with model test results,hence could offer reference for selecting proper diversion pier for sluice-pump station project.