CAJ | 학술논문

为了能够在大气压下获得大面积高能量密度的低温等离子体,近年来弥散放电的研究与应用受到广泛关注。采用基于磁脉冲压缩系统的重复频率ns脉冲电源来激励大气压空气中尖板电极结构放电,通过电压电流测量和发光图像拍摄研究了弥散放电的特性。实验结果表明,在常温常压和高重复频率下能够获得大面积均匀的弥散放电,气隙距离增大或减小时,弥散放电分别向电晕放电与火花放电转换。重频ns脉冲放电存在极性效应,电极的小曲率半径处施加负脉冲时需要比正脉冲更高的电场强度才能获得弥散放电。此外,弥散放电的强度随着脉冲上升时间的增大而减弱。因此合适的气隙距离、极不均匀电场的强场处施加正极性脉冲和较陡的脉冲上升时间有利于获得较为强烈的弥散放电。
위료능구재대기압하획득대면적고능량밀도적저온등리자체,근년래미산방전적연구여응용수도엄범관주。채용기우자맥충압축계통적중복빈솔ns맥충전원래격려대기압공기중첨판전겁결구방전,통과전압전류측량화발광도상박섭연구료미산방전적특성。실험결과표명,재상온상압화고중복빈솔하능구획득대면적균균적미산방전,기극거리증대혹감소시,미산방전분별향전훈방전여화화방전전환。중빈ns맥충방전존재겁성효응,전겁적소곡솔반경처시가부맥충시수요비정맥충경고적전장강도재능획득미산방전。차외,미산방전적강도수착맥충상승시간적증대이감약。인차합괄적기극거리、겁불균균전장적강장처시가정겁성맥충화교두적맥충상승시간유리우획득교위강렬적미산방전。
Nanosecond-pulse can generate extremely high power density and large-scale non-thermal plasma, which attracts attentions. We used a repetitive nanosecond-pulse generator based on magnetic compression system to drive gas discharge in atmospheric air with a tube-to-plane gap, and investigated characteristics of diffuse discharge by the measurement of electrical discharge parameters and discharge images. The experimental results show that large scale diffuse discharge can be obtained at atmospheric pressure with high pulse repetition frequency, and the diffuse discharge will transit to corona or spark mode with increasing or decreasing air gap spacing, respectively. Polarity effect occurs in repetitive nanosecond-pulse discharge, with a negative polarity of the electrode of small curvature radius, diffuse discharge needs more electric field for excitation than that with a positive polarity. In addition, intensity of the diffuse discharge decreases with the increase of the rise-time of pulse. Therefore, the diffuse discharge is likely available under certain conditions of proper air gap, high electric field with positive pulse, and fast rise time.