双组分层撞击流反应器流场振荡特性研究  

Study on flow field oscillation characteristics of two-component stratified impinging stream reactor

作　　者：张建伟[1] 阚延勇 董鑫[1] 冯颖[1] ZHANG Jian-wei;KAN Yan-yong;DONG Xin;FENG Ying(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142

出　　处：《高校化学工程学报》2022年第3期380-386,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21476141);辽宁省兴辽英才计划(XLYC1808025);中央引导地方科技发展专项(2020JH6/10500051);沈阳市中青年科技人才项目(RC190323)。

摘　　要：为了研究双组分层撞击流流场振荡特性,选用大涡模拟对反应器内流场进行分析,通过分析一次和二次撞击区域的运动情况,获得了不同进口雷诺数、不同喷嘴间距、喷嘴边界受限程度下撞击面偏斜振荡规律。结果表明,二次撞击后的轴向速度与径向速度分布呈双峰形式,轴向速度与径向速度随雷诺数的增大而增大。二次撞击面发生偏斜振荡,偏斜振荡周期随喷嘴间距增大而增大,随进口雷诺数增大而减小。喷嘴间距越小,偏斜振荡周期对喷嘴边界受限程度越敏感。基于数值模拟结果,得出偏斜振荡周期与各因素之间的无量纲关联式,关联式计算结果与数值模拟值吻合较好,可以很好地预测二次撞击偏斜振荡周期。Large eddy simulation was made to study the flow field oscillation characteristics of two groups of stratified impinging streams in the reactor. By analyzing the motion of the primary and secondary impinging regions, the deflection oscillation laws of the impinging surface under different Reynolds numbers, different nozzle spacing and nozzle boundary restriction(L/u) were obtained. The results show that the distribution of axial velocity and radial velocity after secondary impact was bimodal, and the axial velocity and radial velocity increased with the Reynolds number. The secondary impact surface had skew oscillation, and the skewed oscillation period increased with the increase of nozzle spacing and decreased with the increase of inlet Reynolds number. The smaller the nozzle spacing was, the more sensitive the deflection oscillation period wa s to the restriction degree of nozzle boundary(L/u). Based on the simulation results, the dimensionless correlation between the deflection oscillation period and various factors was obtained. The calculation results of the correlation are in good agreement with the simulation values, which can well predict the deflection oscillation period of secondary impact.

关 键 词：撞击流 二次撞击 偏斜振荡 振荡周期 大涡模拟 

分 类 号：TQ021.1[化学工程]