首页|Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

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Plasma jet has extensive application potentials in various fields,which normally operates in a diffuse mode when helium is used as the working gas.However,when less expensive argon is used,the plasma jet often operates in a filamentary mode.Compared to the filamentary mode,the diffuse mode is more desirable for applications.Hence,many efforts have been exerted to accomplish the diffuse mode of the argon plasma jet.In this paper,a novel single-needle argon plasma jet is developed to obtain the diffuse mode.It is found that the plasma jet operates in the filamentary mode when the distance from the needle tip to the central line of the argon stream(d)is short.It transits to the diffuse mode with increasing d.For the diffuse mode,there is always one discharge pulse per voltage cycle,which initiates at the rising edge of the positive voltage.For comparison,the number of discharge pulse increases with an increase in the peak voltage for the filamentary mode.Fast photography reveals that the plasma plume in the filamentary mode results from a guided positive streamer,which propagates in the argon stream.However,the plume in the diffuse mode originates from a branched streamer,which propagates in the interfacial layer between the argon stream and the surrounding air.By optical emission spectroscopy,plasma parameters are investigated for the two discharge modes,which show a similar trend with increasing d.The diffuse mode has lower electron temperature,electron density,vibrational temperature,and gas temperature compared to the filamentary mode.

plasma jetdiffuse modefilamentary modeoptical emission spectroscopy

许慧敏、高敬格、贾鹏英、冉俊霞、陈俊宇、李金懋

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School of Information and Electrical Engineering,Hebei University of Engineering,Handan 056038,China

College of Physics Science and Technology,Hebei University,Baoding 071002,China

School of Electrical and Information Engineering,Heilongjiang University of Technology,Jixi 158100,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Hebei Province,ChinaNatural Science Foundation of Hebei Province,ChinaFunds for Distinguished Young Scientists of Hebei Province,ChinaNatural Science Interdisciplinary Research Program of Hebei UniversityPostgraduate's Innovation Fund Project of Hebei University

519770571187512111805013A2020201025A2022201036A2012201045DXK202011HBU2022bs004

2024

10.1088/1674-1056/ad0149

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(1)
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