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- Title
Modeling of Electrode Erosion Process in Gas Spark Switch.
- Authors
Sun, Qiang; Zhou, Qianhong; Yang, Wei; Dong, Ye; Zhang, Hantian; Song, Mengmeng; Zhou, Mei; Yang, Wenyuan
- Abstract
Electrode erosion has become a bottleneck problem restricting the development and application of gas switch. In this paper, a two-dimensional model of interaction between plasma and metal cathode has been developed to describe the electrode erosion process in high power gas spark switch. The model both considers electrode heating process and electrode material removal process by using the volume-of-fluid (VOF) method. The simulation results show that ion bombardment is dominant in the distribution of pressure and energy flux on the cathode surface while the electron emission current plays a most important role in the current density distribution. When increasing ion number density and electron temperature, the cathode temperature will increase significantly, and the cathode crater will be deeper and wider. But with the increase of the near-cathode voltage drop, the cathode temperature will be lower and the cathode crater will be shallower and narrower. Further analysis shows that the erosion depth is mainly closely related to the thermodynamic process while the droplet formation and sputtering are mainly caused by the interaction between surface tension and plasma pressure. At last, through the evaluation of the erosion rate, it can be seen that electrode erosion in high power gas switch is mainly caused by droplets. The numerical simulation results are in good agreement with the experiment.
- Subjects
VACUUM arcs; EROSION; ELECTRON density; ELECTRODES; ELECTRON emission; MANUFACTURING processes; MARANGONI effect
- Publication
Plasma Chemistry & Plasma Processing, 2023, Vol 43, Issue 5, p1195
- ISSN
0272-4324
- Publication type
Article
- DOI
10.1007/s11090-023-10323-0