降低泄水闸胸墙底缘负压的数值模拟研究  

Numerical Simulation on Reducing Negative Pressure at Bottom Edge of Breast Wall Before Spillway Sluice

作　　者：李旭光[1] 樊祥船[1] LI Xu-guang;FAN Xiang-chuan(China Water Northeastern Investigation,Design and Research Co.,Ltd.,Changchun 130021,China)

机构地区：[1]中水东北勘测设计研究有限责任公司,吉林长春130021

出　　处：《水电能源科学》2021年第9期128-130,共3页Water Resources and Power

摘　　要：鉴于胸墙底缘线型是带胸墙的泄水闸水力优化设计的重要内容,以珠江流域西江水系大藤峡水利枢纽工程为例,数值模拟采用标准κ-ε紊流模型,水气两相流耦合采用VOF法,网格划分采用胸墙底缘局部加密和其他区域渐变,上下游水力边界采用垂向分布的压力边界条件,模型求解采用非恒定流方法,计算步长采用自适应变步长法,从水流流态、时均流速分布、紊动动能分布、时均压力分布等方面进行泄水闸胸墙底缘线型优化设计。模拟结果表明,与采用椭圆和直线相切的两段线型相比,泄水闸胸墙底缘采用一段椭圆曲线线型泄流能力符合要求的同时,可降低胸墙底缘负压满足设计要求,保证了建筑物安全。The line type of the bottom edge of the breast wall is an important part of the hydraulic optimization design of the sluice with the breast wall.Taking the Datengxia Water Control Project in the Xijiang Water System of the Pearl River Basin as an example,numerical simulation adopts the standardκ-εturbulence model,and the two-phase flow watergas coupling adopts the VOF method.The mesh is divided by local densification at the bottom edge of the breast wall and other regions are gradually changed.The upstream and downstream hydraulic boundaries adopt vertically distributed pressure boundary conditions.The unsteady flow method with adaptive variable step length is used to solve the model.The bottom edge line type of the breast wall is optimized considering the aspects of flow pattern,time average velocity distribution,turbulent kinetic energy distribution and time average pressure distribution.Compared with the two sections of the tangent of an ellipse and a straight,numerical simulation results show that the use of a section of elliptic curve line type can meet the requirements of discharge capacity,and it can reduce the negative pressure at the bottom edge of the breast wall to ensure the safety of the building.

关 键 词：泄水闸 胸墙底缘 负压 数值模拟 

分 类 号：TV66[水利工程—水利水电工程]