磁场作用下气液两相混合流动的数值研究  

Numerical Simulation of Gas-Liquid Metal Two-Phase Mixing Flow UnderMagnetic Field

作　　者：王彦利 黄护林[1] 方日亮 WANG Yan-Li;HUANG Hu-Lin;FANG Ri-Liang(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 21016,China)

机构地区：[1]南京航空航天大学航天学院,南京210016

出　　处：《工程热物理学报》2021年第9期2367-2377,共11页Journal of Engineering Thermophysics

基　　金：国家重点研发计划(No.2019YFB1901302);装备预先研究项目(No.JZX5Y20190221000301);江苏省研究生科研与实践创新计划项目(No.KYCX20_0224)。

摘　　要：本文采用流体体积法(Volume of fluid,VOF)捕捉气–液态金属两相的交界面,数值研究了有、无外加磁场作用时不同工质对的气–液态金属两相流体在多入口磁流体发电通道中的混合流动过程。结果表明,气–液两相流体在通道中形成了具有周期性变化的两相流型。液态金属密度与气体密度的比值h较大时,分层流中液态金属速度的变化范围较大,但流动较稳定;h较小时,液态金属的界面容易断裂而形成柱状流,使气–液两相流体的接触面积减小,降低了气体对液态金属的携带能力。在磁场的作用下,洛伦兹力抑制了液态金属的流动,削弱了气体对液态金属的携带能力,使三维时空流型的变化周期缩短。In this paper,the volume of fluid(VOF)method was used to capture the interface between gas and liquid metal.The mixing processes of gas-liquid metal two-phase flow for different working fluids were numerically investigated in a multiple entrance magnetohydrodynamic generator(MHDG)channel with and without external magnetic field.The results showed that the gas-liquid metal two-phase flow patterns with periodic variation formed in the channel.When the ratio h of liquid metal density to gas density was larger,the velocity of liquid metal in stratified flow varied widely,but the flow was stable.When h was smaller,the interface of liquid metal was broken and the two-phase fluids flow was of columnar flow,which reduced the contact area of gas-liquid two-phase fluid to decline the carrying capacity of gas to liquid metal.When a magnetic field was applied,the Lorentz force restrained the flow of liquid metal,weakened the carrying capacity of gas to liquid metal and shortened the three-dimensional spatial-time periodic of flow pattern.

关 键 词：气–液态金属两相流 工质对 MHD流动 流型 VOF方法 

分 类 号：O359.1[理学—流体力学]