闸站结合泵站进水池优化数值模拟研究

Optimization of numerical simulation for intake sump in a sluice-pump station

为改善泵站进水池内旋涡、偏流等不良流态及研究十字消涡板对喇叭口下方水体的整流效果,选取某闸站结合泵站工程为研究对象,应用数值计算软件模拟导流墩长度对水流流态的影响,计算各方案下两种不同水位的流速分布均匀度与速度加权平均角,并与对应原始方案下的结果进行比较。应用正交分析法研究十字消涡板尺寸对喇叭口处整流效果的影响,得到导流墩长度为3倍喇叭口直径配合十字消涡板的最佳整流方案,能有效减小旋涡面积。两种水位断面流速分布均匀度较原方案分别提升5.88%和2.73%,速度加权平均角分别提升2.83°和1.13°,流线更加均匀。该整流方案能有效改善水泵的进水条件和喇叭口处旋涡,可为闸站结合泵站工程的多参数优化及设计提供参考。

This study aims to address unfavorable flow conditions,such as vortexes and flow deviation,in the intake sump of a sluice-pump station.The effectiveness of cross-shaped vortex baffles in rectifying flow in the forebay and intake pipes is investigated using numerical simulation.The influence of different lengths of diversion piers on flow state is analyzed,considering flow velocity uniformity and speed-weighted average angle at two water levels:operating water level and low water level.The results are compared with a non-rectification scheme based on parameters from the Sizhihe sluice-pumping station.An orthogonal test method is employed to analyze the impact of the size of the crossvortex eliminator at the horn mouth.The findings indicate that the optimal rectification scheme combines a diversion pier length three times the bell mouth diameter with a cross-vortex eliminator.The cross-vortex eliminator has an upper edge width of 60 mm,a lower edge width of 1 200 mm,a lower base height of 60 mm,a thickness of 10 mm,and an overall height of 160 mm.This scheme significantly reduces the vortex area and improves flow velocity uniformity by5.88% and 2.73%,respectively,while increasing the weighted average angle by 2.83° and 1.33° at the operating water level and low water level compared to the non-rectification scheme.The combined rectification scheme promotes uniform streamlines and effectively enhances water inlet conditions and vortex dynamics at the horn mouth.These research findings provide valuable insights for multi-parameter optimization and the engineering design of pump stations combined with sluice stations.