轴流式气液旋流分离器内气相流场的数值研究.docx

第23卷第5期高 校 化 学 工 程 学报No.5 Vol.232009 年 10月Journal of Chemical Engineering of ChineseUniversitiesOct.2009文章编号：1003-9015(2009)05-0748-08轴流式气液旋流分离器内气相流场的数值研究金向红1,2,金有海1,王建军1,王振波1(1. 中国石油大学(华东) 多相流实验室,山东 东营257061;2. 安徽理工大学 化工学院, 安徽 淮南232001)摘 要：应用 RSM 湍流模型对内径 100 mm 的轴流导叶式气液旋流分离器内气相流场进行了数值研究，计算得到的气流时均速度分布和压力分布与实验测量结果基本吻合。根据分离器内气相流动分布的特点可知：(1)气流旋转强度与导向叶片出口角有关，出口角越大，切向速度越小；(2)排气管下口区域存在明显的短路流分布，容易卷吸夹带液滴进入排气管逃出，造成分离效率下降； (3)排气口和排液口附近的区域气流湍流脉动强度高，容易造成液滴破碎，直径减小，从而影响分离效率。以上研究结果为轴流导叶式气液旋流分离器的结构优化，进一步提高分离性能奠定了基础。关键词：气液旋流分离器；流场；数值模拟；LDV中图分类号：TQ051.84；TQ028.24文献标识码：ANumerical Simulation of Gas-Phase Flow Field in an Axial Flow TypeGas-Liquid Cyclone SeparatorJINXiang-hong1,2,JIN You-hai1,WANGJian-jun1,WANGZhen-bo1(1. Institute of Multiphase Flow, University of Petroleum (East China), Dongying 257061,China;College of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001,China)Abstract: The Reynolds Stress model (RSM) was used to simulate the gas flow in an axialguide-vanegas-liquidcycloneseparatorwithdiameterof100mm.ThenumericalresultsofthetimemeangasvelocitydistributionandpressuredistributionareingoodagreementwiththeexperimentaldatameasuredbyLaserDoppler Velocimeter (LDV) and pressure measuring probe, respectively. According to the gas flowdistribution,thefollowingpointswerefound:(1)Therotationintensityofgasflowinthecycloneisrelatedtotheoutletangleoftheguide-vane.Theguide-vanewithbiggeroutletanglewillcauseasmallergastangentialvelocityinthe cyclone and reduce the gas flow rotation intensity; (2) There is a strong short-cut flow below the exitregionofthegasdischargetube,whichmakestheliquiddropleteasiertobecarriedoutfromthegasdischargetubeandreducestheseparationefficiency;(3)Thegasturbulentfluctuationisveryhighintheregionsofliquiddischarge and gas exit, which is easier to break the liquid droplet and causes a bad separation performance.Thisworkcouldofferabaseforthestructureoptimizationoftheaxialguide-vanecycloneseparatorandimprovingits separa