Numerical simulation of air DBD under standard atmospheric pressure

Abstract

In order to study the mechanism of dielectric barrier discharge (DBD) producing non-equilibrium plasma, the DBD equipment was simplified into a one-dimensional model. The AC power supply voltage was set as 18 kV, the frequency was set as 10 kHz, and the discharge medium was N₂ and O₂ with a mass fraction of 4:1 to simulate the air. The impact cross-section, electron mobility and initial electron temperature of the discharge reaction were determined by BOLSIG+. The electric potential field diagram, voltage current relation diagram, electron density diagram, temperature distribution diagram and electron energy distribution function EEDF diagram are obtained. The results show that the electric field reaches the maximum near the gap sheath. Due to the generation of an additional electric field, the current density reaches the maximum at the rising edge of the air gap voltage. The continuous ionization of air particles in the discharge process leads to the accumulation of electrons and the formation of electron collapse, which leads to the increase in electron density and the decrease in electron temperature. As the reduced electric field E/N increases, the proportion of high-energy electrons in the total electron number increases. At this time, the reaction of non-equilibrium plasma intensifies, and more active substances can be produced.

KEYWORDS:

• DBD
• plasma
• electron density
• electron temperature
• EEDF

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Key Laboratory of the Ministry of education for improving oil and gas recovery (NEPU-EOR-2021-01), National Natural Science Foundation of China ‘Study on the mechanism of non-equilibrium plasma induced condensation of supersaturated steam’ (No. 51706023), Project supported by special fund for postdoctoral in Heilongjiang Province (No. lbh-z20118).

Notes on contributors

Xiaobing Wang

Xiaobing Wang, born in October 1971, male, associate professor, doctor, research direction: Theory and application of complex fluid flow.

Chenyang Zhu

Chenyang Zhu, born in August 1997, male, Master student, research direction: Theory and application of complex fluid flow.

Lu Wang

Lu Wang, born in August 1999, female, Master student, research direction: Theory and application of complex fluid flow.

Jinqiu Liu

Jinqiu Liu, born in September 1998, female, Master student, research direction: Theory and application of complex fluid flow.

An Jin

An Jin, born in May 1998, female, Master student, research direction: Theory and application of complex fluid flow.