立式缩放管内液固颗粒群浓度分布与汇聚特性  

Distribution characteristics and convergence of particles in converging-diverging tube

作　　者：彭德其[1] 冯源 王依然 谭卓伟 俞天兰[2] 吴淑英[1] PENG Deqi;FENG Yuan;WANG Yiran;TAN Zhuowei;YU Tianlan;WU Shuying(School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,Hunan,China; School of Mechanical Engineering,Hunan University of Technology,Zhuzhou 412007,Hunan,China)

机构地区：[1]湘潭大学机械工程学院,湖南湘潭411105 [2]湖南工业大学机械工程学院,湖南株洲412007

出　　处：《化工进展》2022年第9期4662-4672,共11页Chemical Industry and Engineering Progress

基　　金：湖南省自然科学基金(2018JJ4054)。

摘　　要：为分析颗粒群在立式缩放管内的运动规律,基于计算流体力学-离散单元(CFD-DEM)耦合方法模拟研究缩放比γ、肋高e和颗粒进口浓度α对管内颗粒群浓度分布与汇聚特性的影响。结果表明:在研究参数范围内,颗粒群的轴向浓度分布较为均匀,管下部颗粒滞留相对较多;颗粒群径向相对浓度遵循管中心区域浓度低,近壁面颗粒相对浓度较高的规律;肋高e=1.0mm的缩放管在颗粒进口浓度α≤2%时,管壁附近颗粒浓度最高。在管段中上部颗粒运动相对稳定阶段,在肋高e=2.0mm与缩放比γ≤1.0、颗粒进口浓度α≥3%工况下,颗粒群易出现汇聚现象。In order to analyze the motion laws of particle swarm in vertical converging-diverging tube,the effects of converging-diverging ratioγ,rib height e and particle inlet concentrationαon the concentration distribution and convergence characteristics of particle swarm in vertical convergingdiverging tube were simulated by the coupled CFD-DEM method.The results showed that the axial concentration of the particle group was relatively uniform,and more particles were retained in the downer part of the tube within the research parameters.The relative concentration of particles in the radial direction followed the rule of low concentration in the center of the tube and high concentration near the wall.When the inlet concentration of particlesα≤2%,the particle concentration near the pipe wall was high in the scaler with rib height e=1.0mm.In the relatively stable stage of particle movement in the middle and upper part of the pipe section,when rib height e=2.0mm,scaling ratioγ≤1.0 and particle inlet concentrationα≥3%,particle swarm were more likely to convergence.

关 键 词：两相流 计算流体力学-离散单元 粒子图像测速法 缩放管 颗粒汇聚 浓度分布 

分 类 号：TK124[动力工程及工程热物理—工程热物理]