圆环挡板振荡流反应器内流动特性的数值模拟  

Numerical study of flow characteristics in an oscillatory flow reactor with orificial baffles

作　　者：曾嘉 曾晨[1] 周鹏 郭苏雅 崔佳鑫 鄂殿玉 Zeng Jia;Zeng Chen;Zhou Peng;Guo Suya;Cui Jiaxin;E Dianyu(Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学江西省颗粒系统仿真与模拟重点实验室,江西赣州341000

出　　处：《材料与冶金学报》2022年第3期162-166,共5页Journal of Materials and Metallurgy

基　　金：国家自然科学基金(51904122);江西省科技厅重点研发计划(20192BBHL80016);动力工程多相流国家重点实验室开放基金(SKLMF-KF-1901);中国博士后科学基金(2021M690975)。

摘　　要：采用计算流体力学方法,对冶金化工生产过程常用的圆环挡板振荡流反应器内的流动特性进行模拟研究.通过构建k-ε湍流模型、分离涡模拟(DES)湍流模型和剪切应力输运(SST)湍流模型,对挡板振荡管进行模拟计算,对比分析了计算得到的周期平均速度、湍动能和流体流型等关键参数与实验结果,验证考察了3种湍流模型对挡板振荡管内复杂湍流运动行为描述的准确性.结果表明:3种湍流模型中,SST湍流模型能更好地描述挡板振荡管内的流体力学行为;振荡流反应器内流体轴向速度沿管径呈抛物线型分布,在壁面处速度接近为0,中心区域的速度最大约为0.075 m/s;圆环挡板附近漩涡的持续形成和相互作用过程是混沌流发展的主要机制.The turbulent flow behaviors in an oscillatory flow reactor with orificial baffles, which is widely utilized in metallurgical and chemical processes, is numerically studied by using computational fluid dynamics(CFD) approach. In order to identify an appropriate turbulence model among the k-ε, the detached eddy simulation(DES) and the shear stress transport(SST) models, they are examined by comparing the main parameters of cycle average velocity, turbulent kinetic energy and fluid flow pattern with these of the experimental ones. It shows that the predicted results by SST model agree well with the experimental data. The radial distribution of phase-averaged axial velocity presents a parabola pattern, and the maximum value is around 0.075 m/s along the volume center while that is approximate 0 near the boundary. Additionally, the continuous vortex rings formation and interaction around the orificial baffles are consequently regarded as the main reason for chaos flow development.

关 键 词：冶金化工过程 振荡流反应器 计算流体力学 湍流模型 流动特性 

分 类 号：TF19[冶金工程—冶金物理化学]