Alternating current-driven non-thermal arc plasma torch working with air medium at atmospheric pressure

Alternating current-driven non-thermal arc plasma torch working with air medium at atmospheric pressure
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常压空气介质工作的交流电非热电弧等离子炬

DOI:
10.1088/0022-3727/46/45/455204
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发表时间:
2013-11
期刊:
Journal of Physics D: Applied Physics
影响因子:
--
通讯作者:
Meng Yuedong
Meng Yuedong
中科院分区:
其他
文献类型:
--
作者:
Ni Guohua;Lin Qifu;Li Lei;Cheng Cheng;Chen Longwei;Shen Jie;Lan Yan;Meng Yuedong

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本文利用电学和光谱技术研究了高频交流等离子体炬在空气介质中的放电特性。简单的结构和紧凑的交流等离子体炬与谐振电源相结合,可以产生高电压、低电流的低功率放电(低于1kW)。放电呈现负阻特性,其曲线随气体流量的增大而上移。研究了功率对NO(A2Σ+→X2Π)、OH(A2Σ→X2Π,0-0)、N2(C3Πu→B3Πg)、Hα和O的发射强度的影响及其在等离子体射流轴向的空间分布。结果表明,随着功率消耗的增加,NO、OH、N_2、H_α和O的发射强度增大。随着等离子体射流与喷嘴出口轴向距离的增加,OH的发射强度先增大后减小,而其他组分的发射强度急剧减小。振动温度远高于气体温度,说明交流弧光放电偏离了热平衡等离子体。
This work is devoted to the investigation of the discharge characteristics of high-frequency alternating current (ac) plasma torch working with air medium using electrical and spectroscopic techniques. A simple structure and compact ac plasma torch associated with a resonance power supply allows the generation of low power discharges (lower than 1 kW) with high voltage and low current. The discharge shows a negative resistance characteristic, and its curve shifts up with gas flow increased. The effects of power on the emission intensity of NO (A 2Σ+ → X 2Π), OH (A 2Σ → X 2Π, 0–0), N2(C 3Πu → B 3Πg), Hα and O and their spatial distributions in plasma jet axial direction were investigated. It has been found that the emission intensities of NO, OH, N2, Hα and O rise with an increase in power dissipation. With increasing axial distances of plasma jet from nozzle exit, the emission intensity of OH increases and then decreases, while the emission intensities of other species decrease sharply. The vibrational temperature is much higher than the gas temperature, which demonstrates the ac-driven arc discharge deviation from thermal equilibrium plasma.
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