氮氧比对大气压氨气介质阻挡非对称性放电转变影响的数值研究

打开文本图片集

中图分类号：0461 文献标志码：A

Abstract：Toidentifytheconditionsgoverningthetransitionfromoneasymmetricmodetoanother，anone-dimensionalfluidmodel basedonthecontiuityequationandenergyquationisstablishd，andthefinitelementmethodismploedtoumericalyinestigate the influence of the N2/02 ratio on the asymmetric transition in an atmospheric helium dielectric barrier discharge are conducted usingaone-dimensionalfluidmodel.Thesimulationresultsshowthat（1）therearetwodiferentasymmetricdischarges.（2）withthe increase of the N2/02 ratio，the discharge can transit from one asymmetric discharge to another and the dominant positive ion transits from O2+ to N2+ .The asymmetric discharge transitionis due to thecompetitionbetween the penning ionizationof oxygen molecules and nitrogen molecules byhelium metastable atoms，which is determinedby the helium metastableatoms density and he N2/O2 ratio.The simulation results provide deeper insights into the roles of O2 impurity and N2 impurity in the asymmetric discharge transition.

Keywords：asymmetric discharge; N2/02 ratio;transition;penning ionization

介质阻挡放电（Dielectric Barrier Discharge，DBD）是一种典型的非平衡放电，在等离子体医学和聚合物表面改性等领域有着广泛的应用[1-2]。（剩余16298字）