中国物理B ›› 2024, Vol. 33 ›› Issue (1): 15205-15205.doi: 10.1088/1674-1056/ad0149

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

Hui-Min Xu(许慧敏)1, Jing-Ge Gao(高敬格)1, Peng-Ying Jia(贾鹏英)2,†, Jun-Xia Ran(冉俊霞)2, Jun-Yu Chen(陈俊宇)2, and Jin-Mao Li(李金懋)2,3   

  1. 1 School of Information and Electrical Engineering, Hebei University of Engineering, Handan 056038, China;
    2 College of Physics Science and Technology, Hebei University, Baoding 071002, China;
    3 School of Electrical and Information Engineering, Heilongjiang University of Technology, Jixi 158100, China
  • 收稿日期:2023-08-15 修回日期:2023-09-17 接受日期:2023-10-09 出版日期:2023-12-13 发布日期:2024-01-03
  • 通讯作者: Peng-Ying Jia E-mail:jiapengying@hbu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51977057, 11875121, and 11805013), the Natural Science Foundation of Hebei Province, China (Grant Nos. A2020201025 and A2022201036), the Funds for Distinguished Young Scientists of Hebei Province, China (Grant No. A2012201045), the Natural Science Interdisciplinary Research Program of Hebei University (Grant No. DXK202011), and the Postgraduate’s Innovation Fund Project of Hebei University (Grant No. HBU2022bs004).

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

Hui-Min Xu(许慧敏)1, Jing-Ge Gao(高敬格)1, Peng-Ying Jia(贾鹏英)2,†, Jun-Xia Ran(冉俊霞)2, Jun-Yu Chen(陈俊宇)2, and Jin-Mao Li(李金懋)2,3   

  1. 1 School of Information and Electrical Engineering, Hebei University of Engineering, Handan 056038, China;
    2 College of Physics Science and Technology, Hebei University, Baoding 071002, China;
    3 School of Electrical and Information Engineering, Heilongjiang University of Technology, Jixi 158100, China
  • Received:2023-08-15 Revised:2023-09-17 Accepted:2023-10-09 Online:2023-12-13 Published:2024-01-03
  • Contact: Peng-Ying Jia E-mail:jiapengying@hbu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51977057, 11875121, and 11805013), the Natural Science Foundation of Hebei Province, China (Grant Nos. A2020201025 and A2022201036), the Funds for Distinguished Young Scientists of Hebei Province, China (Grant No. A2012201045), the Natural Science Interdisciplinary Research Program of Hebei University (Grant No. DXK202011), and the Postgraduate’s Innovation Fund Project of Hebei University (Grant No. HBU2022bs004).

摘要: 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.

关键词: plasma jet, diffuse mode, filamentary mode, optical emission spectroscopy

Abstract: 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.

Key words: plasma jet, diffuse mode, filamentary mode, optical emission spectroscopy

中图分类号:  (Other gas discharges)

  • 52.80.Tn
52.50.Dg (Plasma sources) 52.70.Kz (Optical (ultraviolet, visible, infrared) measurements)