Liu Jiachun, Zhang Shuangqing, Huang Biao, Zhu David Z
School of Civil and Environmental Engineering, Ningbo University, Ningbo, Zhejiang 315211, China E-mail:
Water Sci Technol. 2021 Mar;83(6):1286-1299. doi: 10.2166/wst.2021.061.
Storm geysers increasingly occur in sewer systems under climate change and rapid urbanization. Mitigation measures are in great demand to avoid safety problems. In this study, three-dimensional computational fluid dynamics models of single-inlet and multi-inlet systems were established to investigate geysering induced by rapid filling and assess the effectiveness of potential mitigation methods. The modeling results suggest that increasing the capacity of the downstream pipe before the inflow front reaches the chamber can effectively reduce the maximum geyser pressure. The peak pressure can be significantly mitigated when the chamber size is designed with care and the drop height between the upstream and downstream pipes is reduced. A diversion deflector with air vents and an orifice plate at the riser top end can alleviate the maximum pressure by about 65% with about 75% of the entrapped air being released. The peak pressure during the geyser event in the multi-inlet model is less than that of a single-inlet model under the same total inflow condition, but more water can be released.
在气候变化和快速城市化的背景下，风暴间歇泉在下水道系统中越来越频繁地出现。迫切需要采取缓解措施以避免安全问题。在本研究中，建立了单入口和多入口系统的三维计算流体动力学模型，以研究快速注水引发的间歇泉现象，并评估潜在缓解方法的有效性。模拟结果表明，在水流前锋到达腔室之前增加下游管道的容量可以有效降低最大间歇泉压力。精心设计腔室尺寸并减小上下游管道之间的落差时，峰值压力可得到显著缓解。在立管顶端带有通风口和孔板的导流偏转器可以将最大压力降低约65%，并释放约75%的截留空气。在相同总流入量条件下，多入口模型中间歇泉事件期间的峰值压力小于单入口模型，但可以释放更多的水。
