某泵站前池流态模型试验研究

Study on the model test of the flow pattern in the forebay of a pumping station

某闸站结合式泵站结构形式复杂,前池易存在严重的不良流态.该文以某泵站为例,采用物理模型试验对其前池的流态进行预测,在设计水位抽排工况下,6台泵全开、自排孔关闭时进行模型试验,为某闸站结合式泵站前池流态分析提供参考.试验结果表明:原设计方案下,前池内出现逆时针方向的回旋流动且回旋流动的范围主要位于导流墙的周围,从而容易在水泵中产生汽蚀.针对原设计方案存在的不足,对其进行改进,得到了一种较优的设计方案,即延长导流墙并开三孔且在前池增加消力墩的方式,该方案能够有效地改善泵站进水条件.

The structure of a gate station with a combined pumping station tends to be complicated,where instable flow regime is likely to exist in the forebay.This article takes a pump station for example and uses physical model tests to make a prediction for its flow regime of front pool.Under the condition of designed water level of pumping station,the model test is performed when 6 pumps are fully-open and the self-draining holes are closed,providing reference for the analysis of flow regime of front pool of station-integrated pumping station.The test results show that under the original design scheme,there is a counterclockwise swirling flow in the forebay,and the scope of the swirling flow is mainly around the diversion wall,which is easy to produce cavitation in the pump.Aimed at the shortcomings of the original design,it was improved and a better design was obtained,that is,the method of extending the diversion wall,opening three holes and adding a stilling pier in the front pool,which can effectively improve the pump Station water conditions.