基于水力过渡计算的双向运行调压池方案优化研究

Optimization of Two-way Operation Surge Tank Scheme Based on Hydraulic Transition Calculation

某水利工程具有供水、发电及抽水的功能,抽水和发电共用的尾水(前池)系统,尾水流道布置复杂、运行水头变幅大。为了满足工程安全运行,对流道布置系统进行了水力过渡计算,发现大波动最不利工况下的尾水池最高涌浪水位高于尾水闸平台设计高程,可能出现尾水闸平台涌水现象,导致工程存在一定安全隐患。针对计算结果的最不利工况,设计不同方案进行深入研究,经多方案比较,最终对双向过流的尾水池出口进行了溢流堰及过渡池设计调整,并按照溢流式调压池模型对流道系统又进行水力过渡计算复核,计算结果表明,工程问题基本得到合理解决。该布置系统虽然复杂,但运行安全性高、可操作性强,管理便捷,且工程已建成投入使用,总体运行状态良好。

A certain water conservancy project possesses the functions of water supply, power generation and pumping, thus arranging a tail water(fore-bay) system shared by pumping and power generation. The runner layout is complex with large water head variations under various working conditions. In order to meet the needs of safe operation, hydraulic transient calculation was conducted based on the runner layout. The calculation results shows that under the most unfavorable working condition with large fluctuation, the maximum surge level of tailrace system is above the design elevation of tailrace gate platform. It may contribute to water inrush of tailrace gate platform, where the potential safety problems may exist. To solve this problem effectively, by doing an in-depth research and comparison on various schemes under the most unfavorable working condition, the overflow weir and transition tank are provided at the outlet of the tailrace pond with two-way flow. The results of the hydraulic transient recalculation and review based on the overflow regulator pool model indicate the engineering problems of the project are reasonably solved. With the characteristics of high security, strong operability and convenient operation and management, the project, although complex, has been completed and tested, and the overall operation is in good condition.