Investigation on performance characteristics of dielectric discharge plasma actuator using pulsed-dc waveform
Investigation on performance characteristics of dielectric discharge plasma actuator using pulsed-dc waveform
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DOI：
10.1299/jfst.2018jfst0018
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发表时间：
2018
影响因子：
0.8
通讯作者：
S. Nakai;H. Nishida;Y. Oshio
中科院分区：
文献类型：
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作者：
S. Nakai;H. Nishida;Y. Oshio
介质阻挡放电等离子体激励器（DBDPA）是一种利用大气压放电产生壁面射流的主动流动控制装置。然而，射流的增强对于高雷诺数流动的应用是必不可少的，因为流速通常仅高达每秒数米。最近，据报道，脉冲DC电压波形可以显著地提高喷射推力（McGowan等人，2016年）。在脉冲直流波形中，高直流电压迅速下降到零并逐渐恢复。在最初的想法中，DC高电压被施加到顶部电极，并且脉冲DC波形被施加到底部电极。在这项研究中，首先，我们进行实验，使用相同的方法提出了由以前的研究，和接下来，DBDPA，其中顶部电极是由脉冲直流波形供电和底部电极电接地，进行了研究。最后，提出了一种新的波形，即周期脉冲接地的正弦电压波形。结果表明，脉冲直流电压波形的DBDPA不能产生强的壁面射流，而所提出的波形产生了显著的射流。尽管其强度与简单正弦波形相同，但可以证实，在脉冲接地前后的阶段，射流推力增强;暂定推力增量高达32%。
Dielectric Barrier Discharge Plasma Actuator (DBDPA) is one of active flow control devices, which generates a wall-surface jet utilizing atmospheric discharge. However, the enhancement of the jet is indispensable for application to high Reynolds number flow because the flow speed is typically only up to several meters per second. In recently, it was reported that a Pulsed-DC voltage waveform can drastically improve the jet thrust (McGowan et al., 2016). In the Pulsed-DC waveform, the high DC voltage rapidly drops to zero and gradually recover. In the original idea, the DC high voltage is applied to the top electrode and the Pulsed-DC waveform is applied to the bottom electrode. In this study, firstly, we conduct experiments using the same method proposed by the previous study, and next, the DBDPA, in which the top electrode is powered by the Pulsed-DC waveform and the bottom electrode is electrically grounded, is investigated. Finally, we propose a new waveform which is a sinusoidal voltage with periodical pulsed-earthing. As a result, the DBDPA with Pulsed-DC voltage waveform cannot generate strong wall-surface jet, and on the other hand, the proposed waveform generates a significant jet. Even though its strength is the same magnitude as that by the simple sinusoidal waveform, it is confirmed that the jet thrust is enhanced at phases before and after the pulsed-earthing; the tentative thrust increment is up to 32 %.