城市排水泵站水力特性及整流措施

为了解弧形进水箱涵城市排水泵站水力特性,探寻改善泵站内部不良流态的整流措施,采用数值模拟方法对城市排水泵站水力流态及整流措施进行研究,并通过物理模型对整流效果进行验证。研究结果表明:弧形进水箱涵城市排水泵站的前池存在主流偏斜与分离流动现象,前池主流集中在中上层,中下层出现大范围的立面环流,底层存在回流,进水池内流态紊乱并出现旋涡,导致水泵进水不够顺畅；设计优化的“方形立柱+组合横梁”的组合式整流措施能够改善前池和进水池的水力流态,前池内的偏流和分离流动消除,底层回流消失,进水池旋涡得到有效抑制,3台水泵进水流道入口流速分布均匀度分别提升了12.0%、8.7%、8.3%,入流速度加权平均角分别提升了7.08°、9.07°、11.40°。

Hydraulic characteristics and rectification measures of urban drainage pumping station

In order to investigate the hydraulic characteristics of urban drainage pumping stations with curved inlet box culvert and explore the rectification measures to improve the adverse flow state inside the pumping station, the hydraulic flow state and rectification measures of urban drainage pumping stations were studied using the numerical simulation method, and the physical model was used to verify the rectification effect. It is found that the main stream of the forebay in the urban drainage pumping station with curved inlet box culvert is skewed and separated. The main stream of the forebay is concentrated in the middle and upper layers, and there is a large range of facade circulation in the middle and lower layers, and backflow in the bottom layer. The flow in the inlet pool is turbulent and vortices appear, resulting in the water not being able to enter the pump smoothly. The combined rectification measure of square column and combined beam was designed and optimized, and it is found that the combined rectification measure can improve the hydraulic flow pattern of the forebay and the inlet pool. The deviation and separation flow in the forebay are eliminated, the bottom backflow disappears, and the vortex in the inlet pool is effectively suppressed. The uniformity values of the inlet flow velocity distribution of the three water pumps were increased by 12.0%, 8.7%, and 8.3%. The weighted average angles of the inflow velocity were increased by 7.08°, 9.07°, and 11.40°.