Sato Shintaro, Furukawa Haruki, Komuro Atsushi, Takahashi Masayuki, Ohnishi Naofumi
Department of Aerospace Engineering, Tohoku University, Sendai, 980-8579, Japan.
Department of Electrical Engineering, Tohoku University, Sendai, 980-8579, Japan.
Sci Rep. 2019 Apr 9;9(1):5813. doi: 10.1038/s41598-019-42284-w.
Electrohydrodynamic (EHD) force is used for active control of fluid motion and for the generation of propulsive thrust by inducing ionic wind with no moving parts. We propose a method of successively generating and accelerating ionic wind induced by surface dielectric-barrier-discharge (DBD), referred to as a DBD plasma actuator with multiple electrodes. A conventional method fails to generate unidirectional ionic wind, due to the generation of a counter ionic-wind with the multiple electrodes DBD plasma actuator. However, unidirectional ionic wind can be obtained by designing an applied voltage waveform and electrode arrangement suitable for the unidirectional EHD force generation. Our results demonstrate that mutually enhanced EHD force is generated by using the multiple electrodes without generating counter ionic-wind and highlights the importance of controlling the dielectric surface charge to generate the strong ionic wind. The proposed method can induce strong ionic wind without a high-voltage power supply, which is typically expensive and heavy, and is suitable for equipping small unmanned aerial vehicles with a DBD plasma actuator for a drastic improvement in the aerodynamic performance.
电流体动力学（EHD）力用于主动控制流体运动，并通过在没有移动部件的情况下诱导离子风来产生推进推力。我们提出了一种相继产生并加速由表面介质阻挡放电（DBD）诱导的离子风的方法，称为具有多个电极的DBD等离子体致动器。由于多个电极DBD等离子体致动器会产生反向离子风，传统方法无法产生单向离子风。然而，通过设计适合单向EHD力产生的施加电压波形和电极布置，可以获得单向离子风。我们的结果表明，使用多个电极可产生相互增强的EHD力，且不会产生反向离子风，并突出了控制介电表面电荷以产生强离子风的重要性。所提出的方法无需通常昂贵且笨重的高压电源就能诱导出强离子风，适用于为小型无人机配备DBD等离子体致动器，以大幅改善空气动力学性能。
