Numerical simulation of anode heat transfer of nitrogen arc utilizing two-temperature chemical non-equilibrium model

doi:10.1088/1674-1056/ac133a

中国物理B ›› 2021, Vol. 30 ›› Issue (9): 95206-095206.doi: 10.1088/1674-1056/ac133a

Numerical simulation of anode heat transfer of nitrogen arc utilizing two-temperature chemical non-equilibrium model

Chong Niu(牛冲), Surong Sun(孙素蓉)^†, Jianghong Sun(孙江宏), and Haixing Wang(王海兴)^‡

School of Astronautics, Beihang University, Beijing 100191, China

收稿日期:2021-05-22 修回日期:2021-07-04 接受日期:2021-07-12 出版日期:2021-08-19 发布日期:2021-08-30
通讯作者: Surong Sun, Haixing Wang E-mail:ssr18@buaa.edu.cn;whx@buaa.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11735004 and 12005010).

Numerical simulation of anode heat transfer of nitrogen arc utilizing two-temperature chemical non-equilibrium model

Chong Niu(牛冲), Surong Sun(孙素蓉)^†, Jianghong Sun(孙江宏), and Haixing Wang(王海兴)^‡

School of Astronautics, Beihang University, Beijing 100191, China

Received:2021-05-22 Revised:2021-07-04 Accepted:2021-07-12 Online:2021-08-19 Published:2021-08-30
Contact: Surong Sun, Haixing Wang E-mail:ssr18@buaa.edu.cn;whx@buaa.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11735004 and 12005010).

摘要/Abstract

摘要： A detailed understanding of anode heat transfer is important for the optimization of arc processing technology. In this paper, a two-temperature chemical non-equilibrium model considering the collisionless space charge sheath is developed to investigate the anode heat transfer of nitrogen free-burning arc. The temperature, total heat flux and different heat flux components are analyzed in detail under different arc currents and anode materials. It is found that the arc current can affect the parameter distributions of anode region by changing plasma characteristics in arc column. As the arc current increases from 100 A to 200 A, the total anode heat flux increases, however, the maximum electron condensation heat flux decreases due to the arc expansion. The anode materials have a significant effect on the temperature and heat flux distributions in the anode region. The total heat flux on thoriated tungsten anode is lower than that on copper anode, while the maximum temperature is higher. The power transferred to thoriated tungsten anode, ranked in descending order, is heat flux from heavy-species, electron condensation heat, heat flux from electrons and ion recombination heat. However, the electron condensation heat makes the largest contribution for power transferred to copper anode.

关键词: nitrogen arc, anode heat transfer, chemical non-equilibrium model, space charge sheath

Abstract: A detailed understanding of anode heat transfer is important for the optimization of arc processing technology. In this paper, a two-temperature chemical non-equilibrium model considering the collisionless space charge sheath is developed to investigate the anode heat transfer of nitrogen free-burning arc. The temperature, total heat flux and different heat flux components are analyzed in detail under different arc currents and anode materials. It is found that the arc current can affect the parameter distributions of anode region by changing plasma characteristics in arc column. As the arc current increases from 100 A to 200 A, the total anode heat flux increases, however, the maximum electron condensation heat flux decreases due to the arc expansion. The anode materials have a significant effect on the temperature and heat flux distributions in the anode region. The total heat flux on thoriated tungsten anode is lower than that on copper anode, while the maximum temperature is higher. The power transferred to thoriated tungsten anode, ranked in descending order, is heat flux from heavy-species, electron condensation heat, heat flux from electrons and ion recombination heat. However, the electron condensation heat makes the largest contribution for power transferred to copper anode.

Key words: nitrogen arc, anode heat transfer, chemical non-equilibrium model, space charge sheath

中图分类号: (Arcs; sparks; lightning; atmospheric electricity)

52.80.Mg

52.40.Hf (Plasma-material interactions; boundary layer effects) 52.65.-y (Plasma simulation) 52.40.Kh (Plasma sheaths)

Chong Niu(牛冲), Surong Sun(孙素蓉), Jianghong Sun(孙江宏), and Haixing Wang(王海兴). Numerical simulation of anode heat transfer of nitrogen arc utilizing two-temperature chemical non-equilibrium model[J]. 中国物理B, 2021, 30(9): 95206-095206.

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Numerical simulation of anode heat transfer of nitrogen arc utilizing two-temperature chemical non-equilibrium model

Numerical simulation of anode heat transfer of nitrogen arc utilizing two-temperature chemical non-equilibrium model

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