Numerical study on effects of chamber design and multi-inlet on storm geyser
Numerical study on effects of chamber design and multi-inlet on storm geyser
复制标题
腔室设计和多入口对风暴间歇泉影响的数值研究
DOI：
10.2166/wst.2021.061
复制
发表时间：
2021-03-15
影响因子：
2.7
通讯作者：
Zhu, David Z.
中科院分区：
文献类型：
--
作者：
Liu, Jiachun;Zhang, Shuangqing;Zhu, David Z.
在气候变化和快速城市化的背景下，雨水间歇泉越来越多地出现在下水道系统中。为避免安全问题，迫切需要采取缓解措施。在这项研究中，三维计算流体动力学模型的单入口和多入口系统建立调查间歇泉引起的快速填充和评估潜在的缓解方法的有效性。模拟结果表明，在入流前缘到达气室之前增加下游管道的容量可以有效地降低最大间歇泉压力。当小心设计腔室尺寸并且减小上游和下游管道之间的落差高度时，可以显著减轻峰值压力。在立管顶端安装一个带有通气孔和孔板的导流板，可以将最大压力降低约65%，同时释放约75%的滞留空气。在相同的总入流条件下，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。
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.