Dynamic characteristics of multi-arc thermal plasma in four types of electrode configurations

Yanjun ZHAO; Guohua NI; Wei LIU; Hongmei SUN; Siyuan SUI; Dongdong LI; Huan ZHENG; Zhongyang MA; Chi ZHANG

doi:10.1088/2058-6272/ac4ee7

Plasma Science and Technology > 2022 > 24(5): 055407. > DOI: 10.1088/2058-6272/ac4ee7

Yanjun ZHAO, Guohua NI, Wei LIU, Hongmei SUN, Siyuan SUI, Dongdong LI, Huan ZHENG, Zhongyang MA, Chi ZHANG. Dynamic characteristics of multi-arc thermal plasma in four types of electrode configurations[J]. Plasma Science and Technology, 2022, 24(5): 055407. DOI: 10.1088/2058-6272/ac4ee7

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Dynamic characteristics of multi-arc thermal plasma in four types of electrode configurations

1.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
2.
University of Science and Technology of China, Hefei 230026, People's Republic of China
3.
Anhui Province Key Laboratory of Medical Physics and Technology, Hefei 230031, People's Republic of China

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Author Bio:
Guohua NI, E-mail: ghni@ipp.ac.cn
Received Date: October 26, 2021
Revised Date: January 21, 2022
Accepted Date: January 24, 2022
Available Online: December 11, 2023
Published Date: April 12, 2022

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Abstract

Abstract

The enhanced volume of thermal plasma is produced by a multi-arc thermal plasma generator with three pairs of discharge electrodes driven by three directed current power suppliers. Combined with a high-speed camera and an oscilloscope, which acquire optical and electric signals synchronously, the dynamic behavior of different kinds of multi-arc discharge adjusted by the electrode arrangement is investigated. Also, the spatial distributions and instability of the arc discharge are analyzed in four electrode configurations using the gray value statistical method. It is found that the cathodic arcs mainly show a contracting state, while the anodic arcs have a trend of transition from shrinkage to a diffusion-like state with the increase of the discharge current. As a result of the adjustment of the electrode configuration, a high temperature region formed in the center of the discharge region in configurations of adjacent electrodes with opposite flow distribution and opposite electrodes with swirl flow distribution due to severe fluctuation of arcs. The discharge voltage rises with increased discharge current in this novel multi-arc plasma generator. It is also found that anode ablation mainly occurs on the conical surface at the copper electrode tip, while cathode erosion mainly occurs on the surface of the inserted tungsten and the nearby copper.
- multi-arc,
- electrode configuration,
- dynamic character,
- erosion

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Acknowledgments

This work was supported by National Natural Science Foundation of China (No. 11875295), and the National Key R&D Program of China (No. 2019YFC0119000).

References (25)

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