南水北调来水调入密云水库调蓄工程典型泵站模型试验研究

Study on the water flow transferred from South-to-North water transfer project to forebay of typical pumping stations in the storage project of Miyun reservoir

通过物理模型,模拟南水北调来水调入密云水库调蓄工程典型泵站前池布置,进行水力试验研究,优化泵站前池设计,提高泵站运行管理水平,为保证泵站群输水稳定和运行安全,提供技术支撑。模型试验以西台上、埝头及溪翁庄等3座典型泵站作为研究对象,模拟了京密引水渠、泵站前池、泵站进水口等建筑物附近的水流变化。在各种不同的流量、水位及水泵机组运行组合的工况下,观测了泵站周围水流结构变化状况,分析了泵站前池、进水口等水流结构变化对泵站的影响,获得了多种安全运行条件下的数据参数。

A physical model is designed and constructed in laboratory to simulate the water flow transferred from South-to-North water transfer project to forebay of typical pumping stations in the storage project of Miyun reservoir. In order to ensure the conveyance stability and operational safety of the pumping station group, hydraulic tests are carried out not only to optimize the forebay design of the pumping stations but also to improve the operational and management level of them. The presented model tests investigate the water flow variation of the nearby structures of Jing-mi channel located in Beijing, the forebay of pumping station, and the pump intake based on the study on the three typical pumping stations： Niantou, Xitaishang, and Xiwengzhuang. A series of test runs are made to delineate the variation of water structure surrounding the pumping stations under different water discharges and levels as well as different operational combinations of pump units. Based on the experimental observations, the influence of the variation of water structures of forebay of pumping station, intake and other components is analyzed. Meanwhile, numerous data parameters are also obtained under a variety of safe operating conditions