Spatiotemporal analysis of streamer discharge in a wire-to-wire reactor with positive nanosecond pulse supply
Spatiotemporal analysis of streamer discharge in a wire-to-wire reactor with positive nanosecond pulse supply
复制标题
正纳秒脉冲源线对线反应器中流光放电的时空分析
DOI：
10.1088/1361-6463/abaa16
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yan Wu
中科院分区：
文献类型：
--
作者：
Zhenyan Liu;Jie Li;Bangfa Peng;Nan Jiang;Yan Wu
利用光电诊断系统研究了大气中正脉冲线对线电极结构中放电流光的时空分布。时间分辨ICCD图像显示，线对线电极中的放电流光分为三个阶段：初级流光，次级正流光和次级负流光。据观察，放电流光的演变是强烈的影响所施加的电压的幅度。OH自由基的发射光谱测量表明，OH主要产生在阳极区附近的次级正流注中。但在阴极附近的区域，由于次级负流光的存在，也可以检测到OH自由基的发射。观察到上升时间、下降时间和脉冲宽度对流光动力学和随后的自由基产生的影响。结果表明，主流光的平均传播速度随上升时间的增加而减小，而脉宽和脉宽参数的变化对主流光的平均传播速度影响不大。基于Box-Behnken设计模型的响应面法，实现了评估的三个关键脉冲参数对臭氧产生的贡献。响应面二次模型的结果表明，在上升时间、下降时间和脉冲宽度三个脉冲参数中，脉冲上升时间对臭氧生成的影响最为突出。
The spatial and temporal distribution of the discharge streamers in positive pulsed wire-to-wire electrode configuration in atmospheric air is investigated by an electrical-optical diagnostic system. Time-resolved ICCD images show that the discharge streamers in wire-to-wire electrode develop in three phases: the primary streamer, the secondary positive streamer, and the secondary negative streamer. It is observed that the evolution of discharge streamers is strongly influenced by the amplitude of the applied voltage. The optical emission spectroscopy measurement of hydroxyl radical OH indicates that the OH is mainly generated in the secondary positive streamer near the anode region. But in the region near the cathode the emission of OH radicals can also be detected due to the secondary negative streamer. The influences of rise time, fall time and pulse duration on streamer dynamics and the subsequent radical production are observed. It is shown that the average propagation velocity of the primary streamer decreases with the increase of the rise time, while the variation of pulse width and pulse duration parameters have little effect on that of the primary streamer. The response surface methodology based on Box–Behnken design model is implemented to evaluate the contribution of the three critical pulse parameters on ozone production. The results of the response surface quadratic model show that the pulse rise time plays the most prominent role in the generation of ozone among the three pulse parameters of rise time, fall time and pulse duration.