TAN Zhi-cheng,YU Jian.Optimization of a Novel Combined Sewer Overflow Storage Tank Based on Numerical Simulation[J].China Water & Wastewater,2021,37(23):114-121.
基于数值模拟的新型合流制溢流调蓄池优化研究
- Title:
- Optimization of a Novel Combined Sewer Overflow Storage Tank Based on Numerical Simulation
- Keywords:
- combined sewer overflow pollution; novel storage tank; computational fluid dynamics; unsteady simulation
- 摘要:
- 针对合流制溢流污染现状，构建了一种有效容积为5 000 m3的新型合流制溢流调蓄池，并利用计算流体力学软件FLUENT对新型调蓄池进行三维的固-液两相流数值模拟，采用稳态模拟与正交试验相结合的方法优化其内部结构并分析池内物理量场的分布；采用非稳态模拟的方法讨论其对场次降雨所产生的溢流污染的去除效果。模拟结果表明，稳态条件下，当水力停留时间为0.7 h时，池体的最佳结构尺寸如下：进水口长度为1.6 m、竖直挡板深度为2 m、水平挡板长度为0.75 m、底部斜板角度为45°，折流段对SS的去除率为97.3%；非稳态条件下，新型调蓄池对重现期≤1年的场次降雨产生的超量溢流污染的去除率为同等体积传统调蓄池的2倍左右。
- Abstract:
- A novel combined sewer overflow storage tank with an effective volume of 5 000 m3 was proposed to solve the current issues of combined sewer overflow pollution. Three-dimensional solidliquid two-phase flow in the novel storage tank was simulated using computational fluid dynamics software. The internal tank structure was optimized through steady-state simulations in conjunction with orthogonal experiments. The distribution of the physical quantities in the tank was analyzed. The performance of the storage tank in removing the overflow pollution caused by field rainfall was discussed by unsteady simulations. The results under steadystate simulations suggested that the optimal dimensions of the tank with a hydraulic retention time of 0.7 h were as follows: inlet length of 1.6 m, vertical baffle depth of 2 m, horizontal baffle length of 0.75 m, and bottom inclined plate angle of 45°. The removal efficiency of SS in the baffle section was 97.3%. Under unsteady states, the removal efficiency of excess overflow pollution caused by rainfalls with return periods less than one year of the novel storage tank was about twice that of the traditional storage tank with the same volume.
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