针对某泵站引水工程的前池流场特性,引入流场运动方程分析理论,利用ANSYS-FLUENT分析软件,研究了原设计前池不同深度流态特征,水流表面分布有1/2的回流漩涡,漩涡流速在水面以下递减,但池壁面处流速随深度增大而增长。对比了淤积前池现状流态呈现较多漩涡回流,超过池内面积2/3,入水口流速随深度增大而降低,3 m处最大流速相比表层降低了50%,仅为0.44 m/s,愈深流速更低加剧了泥沙淤积,主流更靠近左侧边壁面,吸水管方向与水流方向近乎垂直,输水效率大大降低。获得了压水板与底坎6种不同组合改善措施方案,认为距离入水口过近,易导致底坎前末端流速不稳定,出现聚集漩涡；深度为1.2 m时流场稳定,流速适佳,设置压水板距离入水口23 m、深度1.2 m处为最优方案。
Aiming at the characteristics of the flow field in the front pond of a pumping station, the motion equation theoryanalysis of the flow field is introduced. Using ANSYS-FLUENT analysis software, the flow characteristics at different depths of front pond in the original design are studied. Back to the vortex, the vortex velocity decreases below the water surface, but the velocity at the pool wall surface increases with depth. Comparing the current state of the pond before siltation, there are more vortex backflows, which exceed 2/3 of the area in the pond. The velocity of the water inlet decreases with increasing depth. The maximum velocity at 3m is reduced by 50% compared to the surface layer, which are only 0.44m/s. The deeper the flow velocity, the lower the aggravation of sedimentation, the mainstream is closer to the left side wall surface, the direction of the suction pipe is almost perpendicular to the direction of the water flow, and the water transfer efficiency is greatly reduced. Six different combinations of improvement measures were obtained for the pressure plate and the bottom sill. It is believed that too close to the water inlet will cause unstable flow velocity at the front end of the bottom sill and agglomerate vortexes; the flow pattern is stable at a depth of 1.2 m, and the flow rate is good. The optimal solution is that the pressure plate is 23m away from the water inlet and the depth is 1.2m. The thesis provides a certain reference for studying the distribution of the flow field in the front pond of the pumping station and improving the water delivery efficiency of the front pond.