Plasma Volumetric Effects on the Force Production of a Plasma Actuator
Plasma Volumetric Effects on the Force Production of a Plasma Actuator
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DOI：
10.2514/1.j050003
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发表时间：
2010-09
期刊：
影响因子：
2.5
通讯作者：
G. Font;C. L. Enloe;T. McLaughlin
中科院分区：
文献类型：
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作者：
G. Font;C. L. Enloe;T. McLaughlin
对介质阻挡放电等离子体激励器进行了实验和计算研究。实验的时间力测量表明，等离子体致动器产生两个积极的（加速）力每交流周期。当等离子体被点燃时，致动器经历加速力，并且当等离子体熄灭时，出现减速力。这在每个交流偏置周期内发生两次。此外，虽然加速力在交流循环的每一半期间在大小和方向上近似相等，但减速力不相等。对中性气流在给定等离子体力作用下的Navier-Stokes模拟表明，致动器减速力的变化与等离子体本身的结构变化是一致的。这些等离子体结构变化改变了等离子体力施加到空气上的体积，并且进而改变了由等离子体产生的壁射流引起的空气阻力的量。在每个激励器偏置周期中，等离子体激励器提供的70 - 90%的动量在等离子体振荡后立即被壁面阻力破坏。
Dielectric barrier discharge plasma actuators are examined experimentally and computationally. Experimental temporal force measurements show that the plasma actuator produces two positive (accelerating) forces per ac cycle. While the plasma is ignited, the actuator experiences an accelerating force, and, when the plasma is extinguished, a decelerating force appears. This occurs twice during each ac bias cycle. In addition, while the accelerating force is approximately equal in magnitude and direction during each half of the ac cycle, the decelerating force is not. Navier― Stokes simulations of the neutral air flow with a prescribed plasma force reveal that the variation in the decelerating actuator force is consistent with structural changes in the plasma itself. These plasma structural changes alter the volume over which the plasma force is imparted to the air and, in turn, change the amount of air drag incurred by the wall jet created by the plasma. During each actuator bias cycle, 70―90% of the momentum supplied by the plasma actuator is destroyed by drag with the wall immediately after the plasma extinguishes.