【摘要】 为改善城市污水提升双层泵站阶梯消能工的水力流态和消能率，减少阶梯表面冲击影响，基于数值模拟方法，采用RNG k-ε湍流模型和VOF模型分析了阶梯消能工的水力特性，针对阶梯消能工中水流存在的主流偏右和“水翅”等不良流态，提出“分流坎+导流墩+阶梯尾坎”的组合式整流优化方案并分析其优化效果。结果表明：分流坎可以有效增加阶梯左侧的流量，改善偏流的不良流态；导流墩和阶梯尾坎可以减小并均化阶梯出口断面的水流轴向速度，抑制“水翅”的产生；在泵站设计流量工况下，组合式阶梯消能工第一级阶梯的总流量分配均匀度提高了0.42,水平面左侧的最大压强减小了17%,右侧的最大压强减小了21%,组合式阶梯消能工的消能率提升了4.12%。更多还原

【Abstract】 To improve the hydraulic flow pattern and energy dissipation rate of the step energy dissipator in the double-layer pumping station for urban sewage lifting and reduce the impact on the step surface, based on the numerical simulation method, the renormalization group(RNG) k-ε turbulence model and the volume of fluid(VOF) model were used to analyze the hydraulic characteristics of the step energy dissipator. There are adverse flow patterns of the mainstream being biased to the right and “water wings” in the water flow of the step energy dissipator. To address this issue, a combined rectification optimization scheme of “diversion ramp + diversion pier + tail ramp of steps” was proposed, and its optimization effect was analyzed. The results show that the diversion ramp can effectively increase the flow on the left side of the step and improve the adverse flow pattern of the deflected flow. The diversion piers and the tail piers of the steps can reduce and homogenize the axial velocity of the water flow at the exit section of the steps and suppress the formation of “water wings”. Under the design flow conditions of the pumping station, the uniformity of the total flow distribution of the first step of the combined step energy dissipator has increased by 0.42; the maximum pressure on the left side of the horizontal plane has decreased by 17%; the maximum pressure on the right side has decreased by 21%, and the energy dissipation rate of the combined step energy dissipator has increased by 4.12%.更多还原