Moreau Eric, Defoort Etienne
Pprime Institute, CNRS, ISAE-ENSMA, University of Poitiers, Téléport 2, BP 30179, 86962, Futuroscope, France.
Sci Rep. 2022 Nov 4;12(1):18699. doi: 10.1038/s41598-022-23417-0.
Although corona discharges are used in many industrial applications because of their ability to produce chemical species, the ionic wind they induce is less known and often ignored. Therefore, the present study aims at investigating the ionic wind produced by a corona discharge ignited between a high voltage needle and a grounded plate electrode covered by a dielectric material. More specifically, the work focuses on the influence of the high voltage waveform on the temporal behavior of the ionic wind. The results highlight that the high voltage waveform plays a key role on the dynamics of the flow produced inside the discharge. On the one hand, for the sine, triangle and sawtooth waveforms, there is a flow acceleration during both the positive and the negative half-cycles, the positive discharge being more effective in velocity production. On the other hand, for the square waveform, the increase in velocity occurs during the rises and falls of the voltage, because of the strengthening of the electric field due to the ions remaining from the previous half-cycle at the wall of the dielectric material.
尽管电晕放电因其产生化学物质的能力而被应用于许多工业领域，但其所引发的离子风却鲜为人知且常被忽视。因此，本研究旨在探究由高压针与覆盖有介电材料的接地平板电极之间点燃的电晕放电所产生的离子风。更具体地说，这项工作聚焦于高压波形对离子风时间行为的影响。结果表明，高压波形在放电内部产生的气流动力学中起着关键作用。一方面，对于正弦波、三角波和锯齿波波形，在正半周期和负半周期都会有气流加速，正放电在产生速度方面更有效。另一方面，对于方波波形，由于在前半周期残留在介电材料壁上的离子导致电场增强，速度增加发生在电压的上升和下降阶段。
