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在封闭光学玻璃箱体内,应用介质阻挡放电等离子体对20°顶角圆锥附近的静止大气进行了定常和脉冲循环控制,对等离子体诱导的圆锥截面绕流速度场进行了二维PIV测量,在定常控制和脉冲循环控制下,比较分析了最大绕流速度及最大轴向涡量,研究了脉冲频率和电压对上述参数的影响。实验结果表明:存在一个交流电压阈值(Vp-p≈14.0 kV),当电压高于这个阈值后,相对于定常控制模式,脉冲循环控制下沿90°方位角径向线上分布的时间平均切向速度和轴向涡量迅速增加;在脉冲循环控制控制下,动量传递主要表现为分离涡的形成而不是气流的加速。
In a closed optical glass box, a stationary and pulsatile cyclic control of the stationary atmosphere near the 20 ° apex conical was performed by dielectric barrier discharge plasma. Two-dimensional PIV measurements of the plasma-induced conical cross-section velocity field were carried out. Under the control of constant current and pulse cycle control, the maximum flow velocity and the maximum axial vorticity were analyzed and compared. The influence of pulse frequency and voltage on these parameters was studied. The experimental results show that there is an AC voltage threshold (Vp-p≈14.0 kV). When the voltage is above this threshold, the time-averaged distribution along the 90 ° azimuthal radial line under the control of the pulse cycle control The velocity and axial vorticity rapidly increase. Under the control of pulse cycle control, the momentum transfer mainly appears as the formation of separation vortex instead of the acceleration of airflow.