摘要
利用数值模拟,研究了纳秒脉冲介质阻挡放电(NS-DBD)等离子体激励器在圆柱高速流动控制中的应用。首先,研究了单电极NS-DBD等离子体激励器在静止空气中放电后的流场特性。研究表明在介质阻挡放电形成的等离子体区域,有局部能量快速注入,放电结束5μs后在上极板后端点位置形成了一个局部温度高达900K的热点,由此引发很强的压力扰动,形成以上极板后端点位置为中心,扩散速度约为声速的半圆形压缩波。在此基础上,通过数值模拟研究了NS-DBD等离子体激励器布置在直径为6mm的圆柱上,来流马赫数为Ma∞=4.6时,对圆柱脱体激波的控制作用。研究表明介质阻挡放电形成的半圆形压缩波对于脱体激波有很强的干扰作用,激波距离增加了15.7%,激波强度也有相应的减弱,导致阻力减少了13%。
A computational study is performed for nanosecond-pulse dielectric barrier discharge （NS-DBD） plasma actuator using for cylindrical high-speed flow control. First, the flow field characteristic of a single NS-DBD plasma actuator in quies- cent air is studied. The result shows that in the region of dielectric barrier discharge, there is a rapid injection of energy. At 5 tJs after the discharge, a hot spot is formed at the downstream edge of the upper electrode. The maxima temperature of the hot spot reaches up to 900 K. The fast heating effect will result in a strong pressure perturbation and form an asymmetric perturbation wave spreading at the speed of sound. On this basis, the numerical simulation of NS-DBD plasma actuator dis- posed on the cylinder in the free stream Ma~ = 4.6 is presented in this paper. Studies have shown that as the compression wave travels upstream, it interacts with the bow-shock and momentarily increases the bow-shock standing distance and weakens the shock strength, thus resulting in a drag decrease by as much as 13%.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2014年第3期657-665,共9页
Acta Aeronautica et Astronautica Sinica
关键词
纳秒脉冲
介质阻挡放电
激波
流动控制
数值模拟
nanosecond pulse
dielectric barrier discharge
shock
flow control
numerical simulation
