等离子体控制下后台阶流动的数值模拟

Numerical Simulation of Backward-Facing Step Flow Controlled by Plasma

为探究介质阻挡放电等离子体对流动分离的控制效果,应用Fluent软件对后台阶流动的分离和再附着进行数值模拟,并将结果与现有试验进行对比,验证仿真方法的准确性。在此基础上,在台阶后部施加等离子体仿真模型,观察其对后台阶流动分离的控制效果。结果表明:等离子体流动控制能明显减小后台阶流动的再附着长度,且存在最佳控制位置;当来流风速为5 m/s时,可将再附着位置提前45. 27%;当来流风速增加时,等离子体的控制效果变弱;当增加激励电压时,控制效果增强。

In order to explore the effect of dielectric barrier discharge plasma on flow separation,Fluent software was applied to simulate the separation and reattachment of backward-facing step,and the results were compared with the present test to verify the accuracy of the simulation method.On this basis,the plasma simulation model was applied at the back of the step to observe the effect of the flow separation at the back step.The results show that the plasma flow control can obviously reduce the reattachment length of the backward step flow and has the best position.When the incoming flow wind speed is 5 m/s,the reattachment position can be brought forward by 45.27%.When the wind speed of incoming flow increases,the control effect of plasma becomes weak.When the excitation voltage is increased,the control effect is enhanced.