摘要
为研究非浸没撞击流水平对置撞击流反应器的流场特性,采用Fluent软件并利用大涡模拟方法对撞击流反应器在非浸没状态下的流体流动特性进行数值模拟.分析了不同进口速度和喷嘴间距下反应器内流场速度、涡量及压力的分布规律.结果表明:速度大小沿喷嘴轴向呈现先减小后增大的对称分布,而涡量和压力则为先增大后减小的对称分布.随着进口速度增加,撞击区涡量大小和分布范围增大;进口速度为1.77 m·s^(-1)时撞击区中心处涡量最大;当进口速度继续增大时,涡量降低.进口速度从1.00 m·s^(-1)增大到1.30 m·s^(-1)时,射流区压力和径向射流压力迅速减小.当喷嘴间距L=3D,进口速度v=1.77 m·s^(-1)时,涡量最大,有利于混合,是最佳工况.
Impinging flow reactors can greatly facilitate processes such as catalytic reactions,absorption,and liquid-liquid mixing.To study the flow field characteristics of the non-submerged horizontally opposed impinging flow reactor,numerical simulation of the fluid flow characteristics of the reactor under non-submerged conditions was performed using Fluent software and large eddy simulation(LES)method.The distribution laws of flow field velocity,vorticity and pressure in the reactor under different inlet velocities and nozzle spacings were analyzed.The results show that along the axial direction of the nozzles,the velocity presents a symmetrical distribution that first decreases and then increases,while the vorticity and pressure exhibit symmetrical distributions that first increase and then decrease.As the inlet velocity increases,the magnitude and distribution range of the vorticity in the impingement zone increase;the vorticity at the center of the impingement zone reaches its maximum when the inlet velocity is 1.77 m·s^(-1).When the inlet velocity continues to increase,the vorticity decreases.When the inlet velocity increases from 1.00 m·s^(-1) to 1.30 m·s^(-1),the pressure in the jet zone and the radial jet pressure decrease rapidly.When the nozzle spacing L=3D and the inlet velocity v=1.77 m·s^(-1),the vorticity is the largest,which is conducive to mixing and thus constitutes the optimal operating condition.
作者
张建伟
谭良习
董鑫
冯颖
ZHANG Jianwei;TAN Liangxi;DONG Xin;FENG Ying(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《沈阳化工大学学报》
2025年第3期292-303,共12页
Journal of Shenyang University of Chemical Technology
基金
国家自然科学基金(21476141)
辽宁省“兴辽英才计划”项目(XLYC1808025)。
关键词
撞击流
非浸没
大涡模拟
流场特性
impinging stream
non-submerged
large eddy simulation
flow field characteristics
