论文标题
脉冲极性和光电离控制流磁带如何在长气隙中发育
How pulse polarity and photoionization control streamer discharge development in long air gaps
论文作者
论文摘要
使用2D方法来模拟从高压电极在长（14 cm）气隙中以标准压力和温度的长度（14 cm）气隙中出现的正面和负电流的性能。施加的电压从100到500 kV不等。为了揭示光电离的影响，对彩带头前面的各种种子电子产生速率进行了计算。正面和负流媒体的性质之间的差异与彩带头前的电子漂移的不同方向相关。结果，对于正电压极性，彩流器头和彩流速度的峰值电场较高。负流媒体通道中的平均电场约为正流通道中的两倍，与长气隙中的可用测量相一致。结果表明，流媒体头前面的光电离不仅对于发展强阳性放电的发展至关重要，而且对于出现强大的负放电也很重要。光电离速率的增加增加了正流媒体的传播速度，并阻碍了负流媒体的传播。
A 2D approach is used to simulate the properties of positive and negative streamers emerging from a high-voltage electrode in a long (14 cm) air gap for standard pressure and temperature. The applied voltage varies from 100 to 500 kV. To reveal the influence of photoionization, the calculations are made for various rates of seed electron generation in front of the streamer head. The difference between the properties of positive and negative streamers is associated with the different directions of the electron drift ahead of the streamer head. As a result, the peak electric field at the streamer head and the streamer velocity are higher for positive voltage polarity. The average electric field in the negative streamer channel is approximately twice that in the positive streamer channel, in agreement with available measurements in long air gaps. It is shown that photoionization in front of the streamer head is important not only for the development of strong positive discharges, but for the development of strong negative discharges as well. An increase in the photoionization rate increases the propagation velocity of the positive streamer and retards the propagation of the negative streamer.
