基于等离子体激励器后台阶流动控制的数值模拟  

Numerical simulation of controlling backward-facing step flow based on plasma actuator

作　　者：赖晨光 付航[1] 凌志伟 李亮 大林茂 Chen-guang LAI;Hang FU;Zhi-wei LING;Liang LI;Shigeru OBAYASHI(College of Vehicle Engineering,Chongqing University of Technology,Chongqing 400054,China;Institute of Fluid Science,Tohoku University,Sendai 980-8577 Japan)

机构地区：[1]重庆理工大学车辆工程学院,重庆400054 [2]日本东北大学流体科学研究所,日本仙台980-8577

出　　处：《机床与液压》2020年第24期101-108,共8页Machine Tool & Hydraulics

基　　金：国家自然科学基金项目(51305477)。

摘　　要：为探究表面介质阻挡放电(SDBD)等离子体对后台阶流动分离的控制效果,采用Suzen等提出的等离子体对流体作用的数值模拟方法,应用Fluent软件计算电场分布及电荷密度分布方程,最后得到等离子体体积力,并将结果与现有实验数据进行对比,验证仿真方法的准确性。在此基础上,在台阶前部施加等离子体激励,观察其对后台阶流动分离的控制效果。仿真结果表明:等离子体气动激励能明显减小后台阶流动的再附着距离;当来流风速为1 m/s时,可将再附着长度减小53.92%;当来流风速逐渐增加时,等离子体气动激励控制效果逐渐减弱;当增加激励强度时,控制效果增强。In order to explore the effect of surface of dielectric barrier discharge(SDBD)plasma on flow separation of backward-facing step.We used the proposed plasma effect on fluid numerical simulation method by Suzen.Andapplied Fluent software to calculate the electric field distribution and charge density distribution equation.By compared the results with the existing experimental data and verify the accuracy of the simulation method.On this basis,plasma excitation was applied to the front of the step to observe its control effect on the flow separation of the back step.The simulation results show that the plasma aerodynamic excitation can significantly reduce the backward-facing step flow’s reattachement distance.When the incoming flow’s wind speed is 1 m/s,the reattachment length can be reduced by 53.92%.When the incoming flow’s wind speed increases gradually,the effect of plasma aerodynamic excitation control gradually weakens.When the excitation intensity is increased,the control effect is enhanced.

关 键 词：等离子体 后台阶流动 再附着长度 流动分离 

分 类 号：U461.1[机械工程—车辆工程]