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兵工学报 ›› 2017, Vol. 38 ›› Issue (7): 1375-1384.doi: 10.3969/j.issn.1000-1093.2017.07.016

• 论文 • 上一篇    下一篇

绕多孔孔板通气气体与液体两相横射流旋涡特性分析

刘涛涛1, 王国玉1, 张耐民2, 黄彪1   

  1. (1.北京理工大学 机械与车辆学院, 北京 100081;2.北京宇航系统工程研究所, 北京 100076)
  • 收稿日期:2016-10-24 修回日期:2016-10-24 上线日期:2018-04-12
  • 作者简介:刘涛涛(1989—),男,博士研究生。E-mail:liutaotao_0708@126.com
  • 基金资助:
    国家自然科学基金项目(51239005)

Analysis of Vortex Dynamics of Gas-liquid Two-phase Crossflows around a Porous Plate

LIU Tao-tao1, WANG Guo-yu1, ZHANG Nai-min2, HUANG Biao1   

  1. (1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2.Beijing Institute of Astronautical System Engineering, Beijing 100076, China)
  • Received:2016-10-24 Revised:2016-10-24 Online:2018-04-12

摘要: 为了研究通气气体与液体两相流旋涡特性,采用RNG k-ε湍流模型并结合Level Set界面捕捉方法,对绕多孔孔板气体与液体两相横射流流动特性进行了数值模拟,并与实验结果进行了比较。研究结果表明:液相横流受到射流气体的阻碍作用在孔口上游、形成分离鞍点和马蹄涡,此分离鞍点随距壁面高度的增加逐渐靠近孔心,形成分离线;液相横流绕过射流气体后形成两个较为封闭的分离旋涡,此分离旋涡随距壁面高度的增加逐渐远离孔心。射流气体内部反旋转涡对的发展过程可分为3个特征阶段:流动位于孔口附近时,反旋转涡对从壁面逐渐形成,涡核间距和高度不断增大,影响面积不断扩张;随着流动向下游发展,反旋转涡对影响面积不断收缩直至消失;当流动发展至下游某一位置时,反旋转涡对在射流气体顶端再次形成,随着反旋转涡对的不断发展,在平板壁面诱导出2次涡对。

关键词: 流体力学, 气体与液体两相流, 横射流, 数值模拟, 旋涡结构

Abstract: In order to investigate the vortex structures of multiphase flows around a porous plate, the flow characteristics of gas-liquid two-phase crossflows were numerically simulated by using the RNG k-ε turbulence modeland the Level Set model. The simulated results are compared with the experimental results. The research results show that the separation point and the horseshoe vortex are formed since the crossflow is blocked by gas jet, which can be observed at the upstream of the jet hole. With the increases in the distance away from the wall, the separation point gradually gets close to the jet exit hole. The crossflow detours the jet and forms two counter-rotating vortices on the lateral edges of jet, and the vortex evolution depends upon the distance away from the wall. The counter-rotating vortex pairs (CVP) are formed in the jet region. The development process of the vortex pairs can be devided into 3 stages: in the near wake-region (i.e., close to the edge of the jet exit hole), the counter-rotating vortex pairs gradually form on the wall, and the increases in the heights of the vortex cores ae well as the distance between the cores lead to the expansion of vortex area. As the flow develops toward downstream, the area of CVP shrinks and even disappears entirely. Further downstream, the CVP appears again on the top of the jet corresponding to the formation of secondary vortex pairs in the near-wall region. Key

Key words: fluidmechanics, gas-liquidtwo-phaseflow, crossflowjet, numericalsimulation, vortexstructure

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