• 学术论文 •

### 基于火花试验装置的真空放电微观特性模拟研究

1. 1.西安科技大学电气与控制工程学院，陕西西安 710054
2.西安科技大学理学院，陕西西安 710054
• 收稿日期:2020-08-01 修回日期:2021-07-19 出版日期:2021-12-25 发布日期:2021-12-25
• 作者简介:王党树 男，1976年生，陕西武功人.副教授，从事电力电子技术研究.E-mail:wangdangshu@126.com
• 基金资助:
国家自然基金面上项目(51777167);国家自然基金青年项目(51604217)

### Simulation Research on the Microscopic Characteristics of Vacuum Discharge Based on Spark Test Device

WANG Dang-shu1, LUAN Zhe-zhe1, GU Dong-ming1, LIU Shu-lin1, DONG Zhen1, WANG Xin-xia2

1. 1.School of Electrical and Control Engineering，Xi'an University of Science and Technology，Xi'an，Shaanxi 710054，China
2.School of Science，Xi'an University of Science and Technology，Xi'an，Shaanxi 710054，China
• Received:2020-08-01 Revised:2021-07-19 Online:2021-12-25 Published:2021-12-25

Abstract:

In order to study the micro-characteristics of the electrode discharge in the spark test device in vacuum, this paper established a two-dimensional parallel plate discharge model in a vacuum environment with tungsten as the anode material and cadmium as the cathode material. We simulate the model with the PIC/MCC(Particle-In-Cell/Monte Carlo Collision) method, studies the development process of parallel plate electrode discharge under different electron emission mechanisms and the influence of space field strength, cathode surface temperature and field enhancement factor on the changes of space electrons, and obtains the field emission, thermal emission and thermal-field emission changes in the electron concentration and anode absorption current during the discharge process, as well as the spatial distribution of the electron density and electric potential, etc. The research has found that field emission is the dominant emission mechanism of micro-gap cathode electron emission. When the cathode surface temperature reaches 1040K, the boiling point of cadmium metal under the action of Joule heat, cadmium vapor will be generated, and the current density and electron concentration will gradually increase. At this time, the thermal emission will start to act on the micro-gap discharge. When the temperature is greater than the vaporization temperature of cadmium metal, the influence of the field strength will be greater than that of the temperature. When the field enhancement factor is very small, the thermal emission is almost ineffective. As the field enhancement factor continues to increase, the effect of thermal emission gradually increases, leading to a significant increase in the spatial electron concentration. The micro-gap discharge in a vacuum environment is caused by the combined effect of heat and field.