Numerical Simulation of Streamer Propagation and Radical Reactions in Positive Corona Discharge in N2/NO and N2/O2/NO

Two-dimensional calculation of a positive streamer in corona discharge was carried out in the point-plane electrodes in N 2 /NO(300 ppm) and N 2 /O 2 (20%)/NO(300 ppm) at atmospheric pressure. Although similar works have been already published, the distinctive features of our work are (i) the long calculation time (∼500 ns) compared with other works, and (ii) the introduction of chemical reactions. The excited species with short radiative lifetime such as N 2 (B 3 Π g ) and N 2 (C 3 Π u ) are included in addition to radicals and metastable species. First, the physical property of a positive corona streamer was clarified before and after the streamer bridging between the point-plane electrodes. Second, chemical reaction processes in the early discharge stage (∼500 ns) were examined. Particularly, the radical production process and its efficiency were evaluated. Third, the effect of turning off the applied voltage on positive streamer corona discharge was studied.