针板负直流电晕放电中的脉冲等离子体特性  

Characteristics of Pulsing Plasma in Needle-plane Corona Discharge Driven by Negative Direct Power Source

作　　者：何寿杰[1] 张钊[1] 李庆[1] 刘志强[1] HE Shoujie, ZHANG Zhao, LI Qing, LIU Zhiqiang(College of Physics Science and Technology, Hebei University, Baoding 071002, Chin)

机构地区：[1]河北大学物理科学与技术学院

出　　处：《高电压技术》2018年第3期870-875,共6页High Voltage Engineering

基　　金：国家自然科学基金(11205046);河北省自然科学基金(A2016201025);河北大学研究生创新资助项目(X201733)~~

摘　　要：为了提高电晕放电的稳定性,研究了低气压氧气环境中针–板放电结构产生的Trichle脉冲放电特性。测量得到了放电图像和伏安曲线随电流变化的演化特性。结果表明随着电流的增高,放电处于不同的放电模式,分别为汤生放电模式、Trichel脉冲模式和反常辉光放电模式。在气压为532 Pa时,获得了稳定的电压和电流脉冲波形。一个完成的脉冲包含1个极短的上升沿（几μs）、1个较长的下降沿（几十μs）和1个极长的等待时间（〉100μs）。其中脉冲上升沿时间远大于高气压下脉冲的上升沿时间。脉冲的上升和衰减主要由放电时的临界电场决定,电流脉冲的峰值出现时间超前电压最低值。在Trichel脉冲放电模式下,整个放电回路中的电流并不相等。同时研究了氧气和氮气混合气体环境中的Trichel脉冲放电特性。研究结果表明氧气有利于Trichel脉冲的形成。随着氧气含量的增加,可以在更宽的电流范围内产生Trichel脉冲现象,2个相邻脉冲间的等待时间增长,脉冲频率降低。脉冲频率随平均电流的增加线性增加,随着外部并联电容值的增加而降低。In order to improve the stability of corona discharge, the Trichel pulse in oxygen at low pressure was investigated by using a needle-plane electrode.Moreover, the evolution of U-I curve and the images of discharge at different discharge currents were measured. Results show that the discharge is divided into Townsend mode, Trichel pulse mode, and abnormal glow mode when the discharge current increases. Both of discharge pulsing current and pulsing voltage can be obtained at 532 Pa. A complete pulse consists of a quick rising time, a long destroying time, and a much long duration time, which are much longer than those of the pulses obtained at high pressure. The critical electric field controls the rising and destroying time of the pulses. The current peak appears earlier than the minimum of voltage. At the same time, the results show that the oxygen favors the formation of Trichle pulse. With the increasing of oxygen content, the waiting time increases, the width of pulses is constant, and the frequency of pulses decreases. The frequency of pulses increases linearly with the increase of averaged discharge current, and decreases with the increase of parallel capacitance.

关 键 词：电晕放电 针–板电极 Trichel脉冲 临界电场强度 氧气含量 

分 类 号：O53[理学—等离子体物理]