A burst wave-induced plasma actuator for controlling separated flow over a backward-facing step at low Reynolds numbers
A burst wave-induced plasma actuator for controlling separated flow over a backward-facing step at low Reynolds numbers
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DOI：
10.1016/j.expthermflusci.2015.03.016
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发表时间：
2015-09
影响因子：
3.2
通讯作者：
Y. Koide;Ryota Sasaki;Y. Kameya;M. Motosuke
中科院分区：
文献类型：
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作者：
Y. Koide;Ryota Sasaki;Y. Kameya;M. Motosuke
近年来，介质阻挡放电等离子体激励器作为控制分离流的流动控制装置得到了广泛的研究。周期扰动是激发分离剪切层、控制雷诺数Re=0.500左右低雷诺数区域分离的有效方法。本文研究了冲击波诱导等离子体激励器(BWPA)在低雷诺数下控制后向台阶分离流动的基本暂态行为。用粒子图像测速仪测量了静止空气中的时间分辨诱导速度，发现诱导速度与脉冲频率和占空比无关，呈指数增长和衰减。对于后台阶的流动，当诱导流的振荡频率与分离剪切层的接受频率相匹配时，BWPA操作可以显著改善再附着过程。给出了BWPA操作参数与分离流再附着行为之间的关系。
Recently, dielectric barrier discharge plasma actuators have been extensively studied as flow control devices for controlling separated flow. It is known that a periodic disturbance is an effective way to excite a separated shear layer and control the separation in the low Reynolds number region around Re = 500. In this study, the fundamental transient behavior of a burst wave-induced plasma actuator (BWPA) was investigated to control separated flow over a backward-facing step at low Reynolds numbers. The time-resolved induced velocity in quiescent air was measured using particle image velocimetry, and we found that the induced velocity exponentially grew and decayed independently of the burst frequency and duty ratio. For the flow over a backward-facing step, the reattachment process was drastically improved by BWPA operation when the oscillation frequency of the induced flow matched the acceptance frequency of the separated shear layer. We show the relations among BWPA operating parameters and the reattaching behavior of the separated flow.