电场分布对射流等离子体生成特性的影响

Influence of electric field distribution on generation characteristics of plasma jet

为了研究电场分布对射流等离子体生成特性的影响,运用有限元分析软件AnsoftMaxwell,对柱-环、柱-三环、柱-螺旋管、柱-管4种不同射流等离子体电极结构下的电场强度及均匀度等参数进行了电场仿真计算,模拟起始放电前不同电极结构下的电场分布情况.分析电场强度及均匀度等参数对射流等离子体生成的影响,结合相应的实验进行验证.仿真和实验结果表明:4种电极结构的最大电场强度差别不大,起始放电电压大致相同;柱-环电极电场分布最不均匀,容易向弧光放电转化;柱-管电极电场分布最均匀,强电场区域大,易于生成大量稳定的辉光放电等离子体.因此,电场分布越均匀、强电场区域越大的电极结构有利于抑制辉光放电向弧光放电的转变,有利于射流辉光等离子体的生成.

This paper uses finite element analysis software-Ansoft Maxwell, with the purpose of study- ing the influence of Electric field distribution on the generation characteristics of plasma jet. Simulated and calculated the electric field intensity and evenness of the four forms of electrode structures, include column-ring, column-tricyclic, column-spiral tube and column-tube. Simulated the electric field distribution before initial discharge of different electrode structure. Analysis of the impact by the electric field intensity and evenness parameters on the generation of plasma jet, and combined the corresponding experiments. Both simulation and experimental results show that, the maximum electric field strength of the four electrode structures with little difference, and the initial discharge voltages are roughly the same; the electric field distribution of column-ring electrode is most unevenly which is easy changes to arc discharge; the electric field distribution of column-tube is most uniform and the region with strong electric field is great, that is esay to generate a large number of stable glow discharge plasma. Therefore, the more uniform the electric field distribution and the greater the strong electric-field region of the electrode structure is, the more conducive to inhibit the transition from glow discharge to the arc discharge. That is conducive to the generation of glow plasma jet.