竖井及跌水池体形参数对井喷的影响

基于排水系统三维数值模型，研究了不同上下游管道直径比和相对高度、跌水池以及竖井体形参数对井喷压力及强度的影响。模拟结果表明：较小的上下游管道相对高度会导致上游管道内的水流流态为满管流，在上游流量快速增加时会产生较大的井喷压力；减小下游管道直径将会限制进入下游管道的水流流量，进而造成更为严重的井喷事件；跌水池总体积不变情况下增加跌水池高度能够在一定程度上缓解井喷压力；增加竖井的长度对井喷压力影响较小，但会减少喷射水量，增加竖井直径会导致井喷压力先增大后减小。

Influence of shaft and chamber shape parameters on storm geysers

Based on the three-dimensional numerical model of drainage system, the influences of different upstream and downstream pipe diameter ratios and relative heights, chamber and shaft parameters on geyser pressure and intensity were analyzed. The results show that smaller relative height of the upstream and downstream pipes can cause the flow regime in the upstream pipe to be full pipe flow, and the rapid increase in upstream flow can induce greater geyser pressure. Reducing the diameter of the downstream pipe can reduce the transport capacity, resulting in more severe geyser. When the chamber volume is constant, increasing the chamber height can alleviate the maximum geyser pressure. Increasing the shaft length has little effect on the geyser pressure, but it can reduce the volume of water ejected. Increasing the shaft diameter makes the geyser pressure to increase first and then decrease.