Research on Electron Evolution of Atmospheric Pressure Pulsed Dielectric Barrier Discharge Based on Two-dimensional Symmetrical Fluid Model

Abstract

In recent years, plasma technology under atmospheric pressure has been widely used, and it is urgent to study the mechanism of plasma microcosmic particles. With the development of computer technology, it may be a promising method to describe the microcosmic discharge process by simulation. In this study, a two-dimensional symmetrical fluid model of ns pulse dielectric barrier discharge (DBD) at atmospheric pressure was constructed using COMSOL software. The movement behavior of electrons in different working gas, different gap distance and different electrode radius was analyzed. It was found that in helium, the electrons would move to the outside electrode area with low electron density obviously. In argon, the electrons would always be mainly constrained within the electrode area, and the electron density is more than 105 times than that of the initial value. Changing the gap distance will change the diffusion rate and maximum density of electrons. The electron distribution will be more homogeneous, and the density within the electrode area will increase 102-103 times at large gap distance. Changing the electrode diameter has little impact on electron movement behavior. The validity of the model is verified by comparing experimental and simulated voltage and current waveforms.