侧向泵站进水前池流态数值计算与优化

Numerical Calculation and Optimization of Flow Regime in the Inlet Forepool of a Lateral Pump Station

为了优化侧向泵站进水前池流态,消除不良流态对水泵吸水的影响,采用数值计算对某泵站进水池流态进行了分析,在此基础上提出了在进水池进口处布置不同尺寸导流栅的整流方案,分析了整流后的进水池流态。通过结果可知,布置导流栅后达到了相应的整流效果,能让流束通过导流栅格栅较为平顺流入进水池内,改善1~4号进水池内的偏流现象,给水泵创造良好的吸水条件。综合比较各方案计算结果知“3+2”型组合布置形式可使得5个进水池流速不均匀系数趋于稳定,并且与原方案相比流速不均匀系数均有所降低,整流效果明显。

To optimize the flow state of the inlet forepool of the lateral pump station and eliminate the influence of the bad flow patterns on the pump suction, this paper usesnumerical calculation to analyze the flow patterns of the inlet sump of the pumping station, based on which, the rectification scheme is proposed to arrange diversion grid with different sizes at the inlet of the inlet sump, and the flow state of the inlet pool after rectification is analyzed. It can be seen from the results that the corresponding rectification effect is achieved after the arrangement of the guide grid, which can make the flow stream flow into the inlet pool relatively smoothly through the guide grid, improve the bias flow phenomenon in the 1~4# inlet pool, and create a good performance for the feed pump.After a comprehensive comparison and analysis, the rectification schemewith “3+2” type combination layout form is adopted. This rectification scheme can stabilize the uneven coefficients of the five inlet tanks and reduce the uneven coefficients of flow velocity compared with those of the original scheme. The rectification effect is obvious.