Three-dimensional non-equilibrium modeling of a DC multi-cathode arc plasma torch

Zelong ZHANG (张泽龙); Cheng WANG (王城); Qiang SUN (孙强); Weidong XIA (夏维东)

doi:10.1088/2058-6272/abfd19

Plasma Science and Technology > 2021 > 23(7): 75404-075404. > DOI: 10.1088/2058-6272/abfd19

Zelong ZHANG (张泽龙), Cheng WANG (王城), Qiang SUN (孙强), Weidong XIA (夏维东). Three-dimensional non-equilibrium modeling of a DC multi-cathode arc plasma torch[J]. Plasma Science and Technology, 2021, 23(7): 75404-075404. DOI: 10.1088/2058-6272/abfd19

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Three-dimensional non-equilibrium modeling of a DC multi-cathode arc plasma torch

¹ Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, People's Republic of China
² Anhui Advanced Technology Research Institute of Green Building, Hefei 230601, People's Republic of China

Funds: The work is supported by National Natural Science Foundation of China (Nos. 11875256, 12005023, 11705202), Scientific Research Fund Project of Anhui Jianzhu University (No. 2020QDZ09) and Anhui Provincial Natural Science Foundation (No. 1808085MA12).

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Received Date: January 12, 2021
Revised Date: April 27, 2021
Accepted Date: April 27, 2021

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Abstract

Abstract

In this paper, a three-dimensional non-equilibrium steady arc model is used to investigate the temperature, velocity and electromagnetic field in multi-cathode arc torch, and the formation mechanism of a large-area, uniform and diffused arc plasma is analyzed. The numerical simulation results show that a large volume plasma region can be formed in the central region of the generator during discharge. During this process, the maximum electron temperature appears near the cathode and in the central convergence region, while the maximum heavy particle temperature only appears in the central convergence region. This phenomenon is consistent with the experimental arc images. Near the cathode tip, the arc column is in a contraction state. In the area slightly away from the cathode, the six arc columns begin to join together. In the plasma generator, there is a large-scale current distribution in all directions of X, Y and Z, forming a stable arc plasma with a wide range of diffusion. The calculated electron temperature distribution is in good agreement with the measured electron temperature. The results suggest that the large-area diffused arc plasma in the multi-cathode arc torch is the combined effect of current distribution, convection heat transfer and heat conduction.
- temperature uniformity,
- numerical simulation,
- non-equilibrium,
- multiple cathode,
- large-volume arc plasma

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References (35)

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