基于能量梯度理论的泵站侧向进水前池设计优化  

Design optimization of lateral intake forebay structure of pumping station based on energy gradient theory

作　　者：孙众 程炀 刘冠霆 张绿君 SUN Zhong;CHENG Yang;LIU Guanting;ZHANG Lyujun(Yangzhou Survey Design Research Institute Limited Company,Yangzhou 225000,China)

机构地区：[1]扬州市勘测设计研究院,江苏扬州225000

出　　处：《人民长江》2020年第10期138-143,共6页Yangtze River

摘　　要：以高邮市头闸引水泵站工程为例,针对侧向进水前池内存在局部回流和进水池内不良流态的问题进行研究。基于三维不可压缩流体的雷诺时均N-S方程和RNG k-ε湍流模型,采用ANSYS CFX软件对不同方案的侧向进水结构内的流场进行了数值模拟,并基于能量梯度理论对进水结构进行优化。研究结果表明:通过在前池中增设导流墙和弧形底坎可有效消除前池内的回流和进水池内的漩涡;原方案、方案1和方案2中吸水喇叭管进口横断面流速均匀度分别为78.7%,84.6%和90.2%;大尺度回流和漩涡发生位置的能量梯度K值较大,通过能量梯度理论揭示了泵站侧向进水结构内不稳定流场的机理。研究结果可为类似工程进水结构优化提供一定的参考。Taking the Touzha diversion pump station in Gaoyou City as an example,this paper studied the problems of local reflux and bad flow regime in the lateral intake forebay.The flow field in the intake forebay under different schemes was simulated by ANSYS CFX software based on Reynolds time N-S equation and RNG k-εturbulence model of 3D incompressible fluid,and the influent structure was optimized based on energy gradient theory.The results showed that by adding diversion wall and arc bottom sill in the forebay,the reflux in the forebay and vortex can be effectively eliminated.The flow velocity uniformity of the inlet cross section of the original scheme,scheme 1 and scheme 2 were 78.7%,84.6%and 90.2%respectively.Energy gradient K value in the large scale reflux and vortex occurrence position were very large.The mechanism of unstable flow field in lateral intake forebay structure of pump station was revealed by energy gradient theory.The results can provide some reference for the optimization of influent structure in similar project.

关 键 词：泵站进水前池 侧向进水 CFD 流态分析 流速均匀度 能量梯度 

分 类 号：TV675[水利工程—水利水电工程]