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论文类型：期刊论文

发表时间：2013-09-01

发表刊物：Gaodianya Jishu/High Voltage Engineering

收录刊物：EI、PKU、ISTIC、Scopus

卷号：39

期号：9

页面范围：2309-2316

ISSN号：10036520

摘要：The formation of plasma bullets' ring-shaped structure in atmospheric pressure helium is analyzed by using a coupled fluid model. The model consists of a two-dimension neutral gas flow module and a one-dimension plasma dynamics module. The obtained radial distributions of the electron's number density and the nitrogen's metastable number density have different structures under different types of reactions or air contents in the model. It shows that total electron impact ionization plays an important role in sustaining the discharge, and together with Penning process, they lead to the shifted-off structure of electron number density. Meanwhile, the ring structure of plasma bullets forms mainly due to the excitation reaction of nitrogen molecule on air contents.