您的位置:首页  > 论文页面

基于拉格朗日拟序结构的复杂多相流动旋涡结构分析

发表时间:2017-10-13  浏览量:1938  下载量:160
全部作者: 吴钦,王宁,黄彪
作者单位: 清华大学热能工程系; 北京理工大学机械与车辆学院
摘 要: 为深入研究复杂多相流流场的结构特点及流动机制,选取方腔通气气液两相流动作为研究对象,利用拉格朗日拟序结构(Lagrangian coherent structures,LCS)分析方法对方腔通气的流场结构及流动特性进行研究。结果表明,方腔通气过程起始阶段气泡束两侧液相流体中形成对称旋涡结构分布,通气发展阶段气泡束及流场旋涡结构出现周期性摆动;对流场结构进行分析发现,涡量无法有效地体现流场旋涡结构随时间的演变,Q分布能较好地捕捉流场的旋涡中心,LCS可以描绘出流场旋涡边界以及液相主流区与回流区交界面,并表征质点经过流场拉扯后的发散程度,反映流场中的涡流拉扯现象。
关 键 词: 流体力学;多相流;旋涡结构;拉格朗日拟序结构
Title: Vortex structure analysis of complex multiphase flow based on Lagrangian coherent structures
Author: WU Qin, WANG Ning, HUANG Biao
Organization: Department of Thermal Engineering, Tsinghua University; School of Mechanical Engineering, Beijing Institute of Technology
Abstract: The structure characteristic and flow mechanism of the complex multiphase flow field are studied deeply, and the gas-liquid two-phase flow in a square cavity is used as the object in this work. Lagrangian coherent structures (LCS) method is utilized to investigate the flow structures and characteristics of the ventilated gas-liquid flow in a square cavity. It is revealed that symmetrical vortex structures are formed on both sides of bubble beam in liquid phase fluid distribution at initial stage of the ventilated process. The bubble beam and vortex structures are periodical swinging during development stage. It is also shown that vorticity cannot reflect the variation of vortex structures with time effectively. The distribution of Q can capture the core of vortexes. LCS have the potential to identify the boundary of vortexes in flow field and the interfaces recirculation zone. The results also indicate the divergence extent of particles under the effect of the flow field and reflect the pull phenomenon of vortexes.
Key words: fluid mechanics; multiphase flow; vortex structures; Lagrangian coherent structures
发表期数: 2017年10月第19期
引用格式: 吴钦,王宁,黄彪. 基于拉格朗日拟序结构的复杂多相流动旋涡结构分析[J]. 中国科技论文在线精品论文,2017,10(19):2200-2209.
 
7 评论数 0
暂无评论
友情链接