Influence Mechanism of Cathode Curvature Radius on Corona Discharge at Microscale

Jingyuan Zhang (), Bei Zhang, Yong Yang, Zhenzu Liu and Hongguang Pan
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Jingyuan Zhang: College of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Bei Zhang: College of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Yong Yang: College of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Zhenzu Liu: College of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Hongguang Pan: College of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Energies, 2024, vol. 17, issue 14, 1-14

Abstract: Micro-corona devices could be extensively utilized in gas sensing, switchgear, biomedicine, and other fields. As the influence mechanism of the cathode curvature radius on micro-corona discharge dynamical processes is very important for performance optimization and the promotion of these devices, a micro-scale corona discharge gas model in a mixture of N 2 -O 2 is proposed based on the fluid–chemical mixing method, which describes the dynamic process of the discharge at atmosphere and normal temperatures. To reveal the influence mechanism of the nanowire curvature radius on the micro-corona discharge, the effect of the cathode nanowire radius on the discharge current, electric field, ionization reaction rate, and charged particle characteristics at different gaps and voltages were determined. The findings indicate that the effect of curvature radius on discharge intensity varies under different gap and voltage conditions. Further analysis indicates that an increase in curvature radius reduces the electric field near the tip while increasing the ionization area and secondary emission area as well as the number of positive ions in the space, consequently affecting the coupling process between the collision ionization and the secondary emission. Especially under the conditions of either small gap or low voltage, a suitable increase in the curvature radius could promote the coupling process and then increase the discharge current.

Keywords: micro-corona devices; corona discharge; cathode curvature radius; ionization process (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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