90°弯管流场的CFD三维数值计算  

Research on Three-dimensional Numerical Simulation of Flow Hydraulic Characteristics of 90°Vertical Bend Pipe

作　　者：夏鹏飞[1] 马强[1] 马琳[1] 乔丹[1] 姚锦华 武易 XIA Peng-fei;MA Qiang;MA Lin;QIAO Dan;YAO Jin-hua;WU Yi(Yangling Vocational & Technical College, Yangling, Shaanxi 712100, China)

机构地区：[1]杨凌职业技术学院,陕西杨凌712100

出　　处：《杨凌职业技术学院学报》2020年第3期1-3,23,共4页Journal of Yangling Vocational & Technical College

基　　金：杨凌职业技术学院自然科学研究基金项目(A2019004)。

摘　　要：采取三种紊流模型与VOF方法对90°弯管流场进行了水气二相流三维数值模拟。特别在上游水箱断面上自编程序使用了水位边界条件,计算得到2.5 m恒压水头下弯管内的速度场、压力场,二次流动现象(迪恩涡),模拟结果表明:三种紊流模型对弯管段的流场模拟近似;弯管段内壁压强均低于外壁压强,且随着弯管角度的增大,压差先增大后减小,最大压差出现在45°截面上,该压差维持着弯管内的二次流动。Three turbulence models were adopted respectively to simulate the elbow flow.Especially when the water level boundary conditions at inlet section are used by self writing programs.The velocity field and pressure field in the upstream vertical pipe under 2.5m water heads,the secondary flow phenomenon(Dean Vortex)in the bend under each water head were obtained.The simulation results showed that three turbulence models can predict the general flow characteristics in the elbow,and the pressure on the inner wall of the elbow was lower than that on the outer wall,with the increase of the bend angle,the differential pressure increases first then reduces,and the biggest differential pressure occurs at 45°section,which maintained the secondary flow in the elbow.

关 键 词：90°弯管 数值模拟 水气二相流 VOF法 二次流动 

分 类 号：U664.84[交通运输工程—船舶及航道工程]