직류 극성 변화에 따른 이온풍 발생 특성 연구

초록

Corona discharge occurs in regions with uneven electric fields, where ionization happens around electrodes with small curvature radius. The resulting ions move through the electric field, transferring momentum to neutral gas molecules, generating ionic wind. Ionic wind offers advantages like fast response, low noise, and low maintenance, making it useful for electric propulsion and cooling technologies. While typical ionic wind generation involves applying voltage to electrodes with small curvature radius, experiments like ion lifter studies have shown differing characteristics when the polarity is reversed. The reasons for these differences in discharge behavior remain unexplained. Therefore, this study examines the effects of applied voltage polarity on corona discharge and ion wind characteristics. The corona onset voltage was lowest for positive polarity discharge(4.70kV), with higher values for other polarities. Discharge currents and ion wind velocities varied by polarity, with significant differences between positive and reverse negative discharges. Additional experiments using shorter electrodes (10mm) showed no differences between polarities, suggesting that the observed characteristics are influenced by the geometry of electrodes with big curvature radius.

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