中隔墩对大型泵站进水流道水力性能的影响

运用数值计算和模型试验相结合的方法,研究了在进水流道进口水流方向偏斜时,中隔墩对进水流道水力损失及流道出口断面的水流均匀度、水流入泵平均角度的影响,并对影响机理进行了初步分析。研究结果表明:在进水流道中设置中隔墩对进水流道的流态影响较小,设计流量时的流道水力损失增加约0.005m;当前池存在横向流速时,中隔墩对改善进水流道内的流态是有利的;进水流道水力损失的增加主要是由于隔墩的存在减小了过流面积,使得水流流速增加所引起的。数值计算和模型试验的结果基本一致。

Influence of Middle Division Pier on the Hydraulic Performance for Inlet Conduit of a Large-scale Pumping Station

The combination method of numerical calculation and model test was applied to investigate the effects of middle division pier on the hydraulic loss and flow uniformity and average flow entrance angle at the outlet conduit when the inflow direction was oblique at the elbow inlet conduit. The influence mechanism was analyzed preliminarily. The research results indicated that (1) the influence of the middle division pier on the flow pattern at the elbow inlet conduit is insignificant with an increasing of hydraulic loss of about 0.005 m under the design discharge; (2) when transverse velocity exists in the forebay, the middle division pier is beneficial to improve the flow pattern at the inlet conduit; and (3) the increasing of hydraulic loss at the inlet conduit is mainly due to the increasing of flow velocity caused by the reduction of flow area. The results obtained from the numerical simulation method were consistent with those determined by the model test method.