期刊
CHINESE PHYSICS B
卷 25, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/25/10/105205
关键词
atmospheric-pressure plasma jet; hydrocarbon; OH radicals; laser-induced fluorescence
资金
- National Natural Science Foundation of China [11465013, 11375041]
- Natural Science Foundation of Jiangxi Province, China [20151BAB212012, 20161BAB201013]
- International Science and Technology Cooperation Program of China [2015DFA61800]
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 C-2 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.
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