Effects of oxygen concentration on streamer propagation and ozone production in a single-filament streamer discharge at atmospheric pressure
Effects of oxygen concentration on streamer propagation and ozone production in a single-filament streamer discharge at atmospheric pressure
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DOI：
10.1088/1361-6463/acc18f
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
A. Komuro;A. Yoshino;Zhenyu Wei;R. Ono
中科院分区：
文献类型：
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作者：
A. Komuro;A. Yoshino;Zhenyu Wei;R. Ono
关于流光放电中化学活性物质相对于氧浓度的形成机制，已经进行了有限的研究，这对于各种应用例如臭氧生成、空气净化和等离子体辅助燃烧等是至关重要的。在此，在大气压和室温下，使N2/O2气体气氛中的氧浓度从1%变化到99%，以研究流光放电传播特性和化学活性种的产生的变化。随着氧气浓度从10%增加到90%，放电电流的衰减率、初级流光的传播速度和臭氧产生效率增加。这些现象定性地解释为电子附着到氧分子的反应和由氧浓度的变化引起的电子能量分布函数的变化。然而，N2（C）的放电发射量不能用N2（C）激发中损失的电子能量分数及其量子产率的变化来解释，这意味着必须以时空方式考虑初级和次级流光中N2（C）产生的变化。这项研究表明，在流光放电臭氧和N2（C）的生产特性的变化与氧气浓度的非线性。
Limited research has been conducted on the formation mechanism of chemically active species in streamer discharges with respect to the oxygen concentration, which is critical to various applications such as ozone generation, air purification, and plasma-assisted combustion, among others. Herein, the oxygen concentration in an N2/O2 gas atmosphere is varied from 1% to 99% under atmospheric pressure and room temperature to investigate changes in the characteristics of streamer discharge propagation and generation of chemically active species. As the oxygen concentration increases from 10% to 90%, the decay rate of the discharge current, propagation velocity of the primary streamer, and ozone production efficiency increase. These phenomena are qualitatively explained by the electron attachment reaction to oxygen molecules and changes in the electron energy distribution function caused by the change in the oxygen concentration. However, the amount of discharge emission from N2(C) cannot be explained by changes in the fraction of electron energy lost in excitation of N2(C) and its quantum yield, implying that changes in the production of N2(C) in the primary and secondary streamers must be considered in a spatiotemporal manner. This study demonstrates that the ozone and N2(C) production characteristics in streamer discharges vary nonlinearly with respect to the oxygen concentration.