Transition of the discharge mode of atmospheric air DBD

In this work, we further investigated the asymmetric dielectric barrier discharge (DBD) as well as the mode transition at atmospheric pressures. Experiments were conducted under varied discharge conditions, including the use of different dielectric materials (Al2O3 ceramic and quartz), polishing of dielectric surfaces to examine the effect of roughness, variation of gas gap width, changes in dielectric thickness, and tests under different gas compositions. Discharge process was simulated using a one-dimensional fluid model, and the discharge mode was analyzed from whether the electron multiplication factor reached the criterion for streamer. It is found that a higher secondary electron emission coefficient, a gas gap smaller than 0.3 mm, and a relatively low applied voltage collectively help to suppress the electron multiplication and promote the formation of a uniform glow DBD.