Synergistic enhanced oxygen pulsed discharge by surface micro-groove structures at atmospheric pressure

A locally enhanced pulsed atmospheric-pressure oxygen discharge induced by surface microstructures with a single dielectric layer is investigated using a two-dimensional fluid model. Through the analysis of electric fields, electron characteristics, and dynamics, the multi-region synergistic discharge mechanism under the periodic micro-groove structures on the dielectric surface at the power electrode side was revealed. It shows that within the micro-groove structure on the dielectric surface, a locally enhanced electric field is formed along the longitudinal direction at the head of the ionizing wave. Along the transverse direction, asynchronous discharge in different regions generates a transverse electric field within the groove, causing electrons to converge toward the groove center. With the reduction of width, the electric field within the groove intensifies, concurrently increasing electron energy and the spatial proportion of high-density electrons in the main discharge region.