誘電体表面の電位分布が対向型プラズマアクチュエータの作動特性に与える影響の実験的研究

抄録

Dielectric Barrier Discharge Plasma Actuator (DBD-PA) is a flow control device consisting of a single dielectric sandwiched between an AC and a ground electrode. In this study, we focus on DBD-PA having two opposing AC electrodes (Facing-PA) which is expected as vortex generator with active controllability. It was reported that the discharge in Facing-PA was enhanced compared to the conventional DBD-PA, and its mechanism was considered to be electric field enhancement due to residual charge on the dielectric surface, but there are no experimental results supporting this hypothesis. In this study, for clarifying the discharge enhancement mechanism of Facing-PA, we experimentally investigate the dielectric surface charging. We conduct the imaging of discharge photoemission and the Pockels measurement of surface charging. For this purpose, the BGO (Pockels crystal) is adopted as the dielectric. As a result, an increase in residual surface charge due to the discharge extending from the opposing electrode is confirmed, but the discharge enhancement effect could not be confirmed, and it imply the residual charge has small impact on the discharge.