中国物理B ›› 2016, Vol. 25 ›› Issue (10): 105205-105205.doi: 10.1088/1674-1056/25/10/105205

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

LIF diagnostics of hydroxyl radical in a methanol containing atmospheric-pressure plasma jet

Mu-Yang Qian(钱沐杨), San-Qiu Liu(刘三秋), Xue-Kai Pei(裴学凯), Xin-Pei Lu(卢新培), Jia-Liang Zhang(张家良), De-Zhen Wang(王德真)   

  1. 1 Department of Physics, Nanchang University, Nanchang 330031, China;
    2 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;
    3 School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023, China
  • 收稿日期:2016-05-22 修回日期:2016-06-16 出版日期:2016-10-05 发布日期:2016-10-05
  • 通讯作者: San-Qiu Liu E-mail:sqlgroup@ncu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11465013 and 11375041), the Natural Science Foundation of Jiangxi Province, China (Grant Nos. 20151BAB212012 and 20161BAB201013), and the International Science and Technology Cooperation Program of China (Grant No. 2015DFA61800).

LIF diagnostics of hydroxyl radical in a methanol containing atmospheric-pressure plasma jet

Mu-Yang Qian(钱沐杨)1, San-Qiu Liu(刘三秋)1, Xue-Kai Pei(裴学凯)2, Xin-Pei Lu(卢新培)2, Jia-Liang Zhang(张家良)3, De-Zhen Wang(王德真)3   

  1. 1 Department of Physics, Nanchang University, Nanchang 330031, China;
    2 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;
    3 School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023, China
  • Received:2016-05-22 Revised:2016-06-16 Online:2016-10-05 Published:2016-10-05
  • Contact: San-Qiu Liu E-mail:sqlgroup@ncu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11465013 and 11375041), the Natural Science Foundation of Jiangxi Province, China (Grant Nos. 20151BAB212012 and 20161BAB201013), and the International Science and Technology Cooperation Program of China (Grant No. 2015DFA61800).

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摘要：

In this paper, a pulsed-dc CH3OH/Ar plasma jet generated at atmospheric pressure is studied by laser-induced fluorescence (LIF) and optical emission spectroscopy (OES). A gas-liquid bubbler system is proposed to introduce the methanol vapor into the argon gas, and the CH3OH/Ar volume ratio is kept constant at about 0.1%. Discharge occurs in a 6-mm needle-to-ring gap in an atmospheric-pressure CH3OH/Ar mixture. The space-resolved distributions of OH LIF inside and outside the nozzle exhibit distinctly different behaviors. And, different production mechanisms of OH radicals in the needle-to-ring discharge gap and afterglow of plasma jet are discussed. Besides, the optical emission lines of carbonaceous species, such as CH, CN, and C2 radicals, are identified in the CH3OH/Ar plasma jet. Finally, the influences of operating parameters (applied voltage magnitude, pulse frequency, pulsewidth) on the OH radical density are also presented and analyzed.

关键词: atmospheric-pressure plasma jet, hydrocarbon, OH radicals, laser-induced fluorescence

Abstract:

In this paper, a pulsed-dc CH3OH/Ar plasma jet generated at atmospheric pressure is studied by laser-induced fluorescence (LIF) and optical emission spectroscopy (OES). A gas-liquid bubbler system is proposed to introduce the methanol vapor into the argon gas, and the CH3OH/Ar volume ratio is kept constant at about 0.1%. Discharge occurs in a 6-mm needle-to-ring gap in an atmospheric-pressure CH3OH/Ar mixture. The space-resolved distributions of OH LIF inside and outside the nozzle exhibit distinctly different behaviors. And, different production mechanisms of OH radicals in the needle-to-ring discharge gap and afterglow of plasma jet are discussed. Besides, the optical emission lines of carbonaceous species, such as CH, CN, and C2 radicals, are identified in the CH3OH/Ar plasma jet. Finally, the influences of operating parameters (applied voltage magnitude, pulse frequency, pulsewidth) on the OH radical density are also presented and analyzed.

Key words: atmospheric-pressure plasma jet, hydrocarbon, OH radicals, laser-induced fluorescence

中图分类号:  (Plasma sources)

  • 52.50.Dg
52.70.Kz (Optical (ultraviolet, visible, infrared) measurements) 82.33.Xj (Plasma reactions (including flowing afterglow and electric discharges)) 52.38.Dx (Laser light absorption in plasmas (collisional, parametric, etc.))