闸站并列布置工程泵站前池流态改善  

Flow pattern improvement in the forebay of pumping station with parallel sluice

作　　者：施伟 倪春 于贤磊 吕复生 刘军 陆林广[2] 徐磊[2] SHI Wei;NI Chun;YU Xianlei;LYU Fusheng;LIU Jun;LU Linguang;XU Lei(The Eastern Route of South-to-North Water Diversion Project Jiangsu Water Source Co.,Ltd,Nanjing 210029,China;College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]南水北调东线江苏水源有限责任公司,南京210029 [2]扬州大学水利科学与工程学院,江苏扬州225009

出　　处：《南水北调与水利科技（中英文）》2023年第4期810-820,共11页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金项目(51779215);江苏南水北调水利科技项目(JSNSBD202105)。

摘　　要：为研究闸站并列布置工程泵站运行时清污机桥位置对前池内水流流态的改善效果,以南水北调东线刘山泵站工程为例,基于Navier-Stokes方程和Standard k-湍流模型对前池原设计方案和改进设计方案的进水流场进行了定常数值模拟,分析比较不同开机组合时前池流场分布和流道进口后断面的流速分布均匀度及速度加权平均角度,并进行水工模型试验验证。结果表明:原设计方案前池在4号和5号机组进水流道进口前存在回旋区,4号机组流道进口前产生有害吸气旋涡;改进设计方案前池将清污机桥整体向泵房方向移动25 m,并将节制闸与泵站间导流墙长度减短使其头部与清污机桥墩齐平,不仅消除了4号机组流道进口处有害吸气涡,还将4号机组进水流道进口流速分布均匀度平均提高2.5%,泵站进水流态改善显著。通过调整泵站进口清污机桥桥墩位置解决了前池流态存在的问题,不需再另增底坎、立柱和导流墩等措施,研究成果可为同类型工程研究提供参考。The project of pumping station with parallel sluice has the advantages of compact layout and small land occupation,and it is widely used in water conservancy projects.For the project of pumping station with parallel sluice,the flow direction of the water flows into the forebay has a certain angle with the longitudinal center line of the forebay when the pumping station is working,so that deviation and backflow is prone to appear in the forebay of pumping station,the flow pattern at the inlet of the inlet conduit will be deteriorated,and a suction vortex belt will be generated in severe cases.The safe and stable operation of the pump unit will be affected when the suction vortex belt enters the pump.In order to study on the improvement of flow pattern in the forebay when the pumping station of the project is arranged in parallel with the sluice station,taking the Liushan Pumping Station in the Eastern Route of the South-toNorth Water Transfers Project as an example,the numerical simulation study on the flow pattern in forebay of the project of pumping station with parallel sluice was carried out based on the Navier-Stokes equations and the RNG turbulence model.Aiming at the flow field problems in the forebay,the improvement measures of moving the cleaning machine bridge to the pump house and shortening the length of the diversion wall between the sluice and the pumping station were proposed,and the flow pattern in the forebay under different schemes was analyzed based on the numerical calculation results,the uniformity and average angle of the cross-sectional flow velocity distribution after the inlet of the inlet conduit of each pump unit were compared,and finally the numerical calculation results were verified by the method of hydraulic overall model test.The research results show that there was a reflux vortex area in the original forebay before the inlets of inlet conduits of No.4 and No.5 pump units of the Liushan Pumping Station in the Eastern Route of the South-to-North Water Transfers Project,and a harmful

关 键 词：闸站并列 前池 流态 清污机桥桥墩 数值模拟 模型试验 

分 类 号：TV131.4[水利工程—水力学及河流动力学]