CAJ | 학술논문

先导发展长度与速度是描述先导发展过程的重要参数,也是近年国内外研究热点。电荷耦合高速摄像机的广泛应用为研究先导发展速度提供了有力工具。为定量研究先导发展速度,利用2台电荷耦合高速摄像机对长空气放电过程进行同步拍摄结果,利用图像处理方法重建了长空气间隙放电先导通道发展过程的三维结构。对12m棒-板间隙在正极性操作冲击电压下先导发展过程进行观测后,基于先导通道三维空间结构的时域演变,将先导发展方式分为平稳发展与＂突跳＂2种方式。在此基础上定量分析了先导发展的一维轴向速度、二维路径速度以及三维空间速度。研究结果表明,在12m棒-板间隙的先导平均一维轴向发展速度为1.8cm/μs,平均二维路径速度为2.03cm/μs,平均三维空间速度为2.3cm/μs;先导通道发生＂突跳＂时,先导通道长度瞬时剧烈增大,发展速度瞬时剧烈增大,发展速度分散性很大,在10～30cm/μs。
선도발전장도여속도시묘술선도발전과정적중요삼수,야시근년국내외연구열점。전하우합고속섭상궤적엄범응용위연구선도발전속도제공료유력공구。위정량연구선도발전속도,이용2태전하우합고속섭상궤대장공기방전과정진행동보박섭결과,이용도상처리방법중건료장공기간극방전선도통도발전과정적삼유결구。대12m봉-판간극재정겁성조작충격전압하선도발전과정진행관측후,기우선도통도삼유공간결구적시역연변,장선도발전방식분위평은발전여＂돌도＂2충방식。재차기출상정량분석료선도발전적일유축향속도、이유로경속도이급삼유공간속도。연구결과표명,재12m봉-판간극적선도평균일유축향발전속도위1.8cm/μs,평균이유로경속도위2.03cm/μs,평균삼유공간속도위2.3cm/μs;선도통도발생＂돌도＂시,선도통도장도순시극렬증대,발전속도순시극렬증대,발전속도분산성흔대,재10～30cm/μs。
Leader development length and velocity are main parameters for describing the propagation of leader. The world-wide use of charge-coupled device high speed camera provides a powerful tool for researching leader development velocity. Based on photographs of long air gap discharge taken by two high speed cameras synchronously, the three dimensional spatial structure of leaders can be reconstructed according to images process method, which is helpful for researching leader length and velocity. According to observing leader propagation process in 12 m air gaps under positive switching voltages in atmospheric pressure, the development styles of leader can be divided into two parts, namely, steady style and sudden-jump style. The leader development velocity in one - dimension, two-dimension, and three-dimension is also analyzed quantitatively, average one- dimensional velocity is 1.8 cm/μs, average two-dimensional velocity is 2.03 cm/μs, and average three-dimensional velocity is 2.3 cm/μs. When leader channels develop in sudden-jump style, the lengths of leader channels increase sharply, the speed of leader channels increases with large variances, in the range of 10 cm/μs to 30 cm/μs.