多机组泵站正向进水阵列式隔板整流模拟及试验验证

Numerical simulation and experimental verification of forward feed array diaphragm rectifier for multi-unit pumping station

针对多机组正向进水泵站前池内存在不良流态的问题,采用CFD与模型试验相结合的方法,对不同开机工况下的泵站前池流场进行了研究,提出一种利用阵列式隔板整流的措施,并评判了阵列式隔板整流的效果.计算结果表明:在4种不同开机工况下,前池内均存在大范围的回流与旋涡区,前池出口断面流速均匀度为38.42%~57.39%,水泵进水条件较差.为改善正向进水泵站前池的不良流态,提出一种利用阵列式隔板整流的措施.采用阵列式隔板整流后,前池内回流与旋涡区得到减小、转移,回流与旋涡区对主流的挤压明显减弱,前池出口断面流速均匀度提高到47.23%~63.17%,水泵进水条件得到显著改善.试验测量结果与数值计算结果基本吻合,数值模拟得到了试验的验证.研究成果可为多机组正向进水泵站的建设运行提供参考.

Aiming at the problem of bad flow patterns in the forebay of forward intake pumping station with multi-units,the flow field in the forebay of pumping station under different start-up conditions was studied by CFD and model test,a method of using array diaphragm as rectifier was put forward,and the effect of array diaphragm as rectifier was evaluated.The results show that there is a large area of circumfluence and vortex in the forebay under three different start-up conditions.The velocity uniformity at the outlet of the forebay is 38.42%-57.39%,and the condition of water inlet of the pump is poor.In order to improve the bad flow pattern in the forebay of forward intake pumping station,an array baffle is used to rectify the flow pattern.After adopting the array baffle,the backflow and vortex area in the forebay are reduced and transferred,and the extrusion of the backflow and vortex area to the main stream is obviously weakened.The velocity uniformity at the outlet section of the forebay is increased to 47.23%-63.17%,the water inlet condition of the pump is improved remarkably.The experimental results are in good agreement with the numerical results,and the numerical simulation is verified by the experiment.The research results can provide a reference for the construction and operation of multi-unit forward intake pumping station.