Thermal and Chemical Nonequilibrium Effects in Free-Burning Arcs
Thermal and Chemical Nonequilibrium Effects in Free-Burning Arcs
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DOI：
10.1007/s11090-015-9650-9
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发表时间：
2015
影响因子：
3.6
通讯作者：
M. Baeva
中科院分区：
文献类型：
--
作者：
M. Baeva
介绍和讨论了氩气中自由燃烧电弧中热不平衡和化学不平衡所引起的影响。结果涵盖了100和200 A之间的电弧电流，5-10 mm的电极间距离的范围内，和电极材料和阴极尖端的形状的变化。结果表明，近极区的非平衡状态对电弧温度、电导率、电流密度和电弧电压的分布有很大的影响。偏离阴极附近的化学非平衡作为运输过程的结果表示。此外，过剩的原子基态靠近电弧轴，根据人口的激发态在电弧周边相对于平衡值，轴向依赖性的轴向最大的径向发射系数的Ar I在696.5 nm，和增强人口的Ar（1 s4）共振能级由于捕获的共振辐射在电弧周边。
Effects caused by thermal and chemical nonequilibrium in free-burning arcs in argon are presented and discussed. The results cover a range of arc currents between 100 and 200 A, interelectrode distance of 5–10 mm, and a variation of the electrode material and the shape of the cathode tip. The results obtained show that nonequilibrium in the near-electrode regions has a strong impact on the distributions of temperatures, electric conductivity and current density, and the arc voltage. Departure from chemical nonequilibrium in the vicinity of the cathode as a result of transport processes is indicated. Moreover, overpopulation of the atomic ground state close to the arc axis, under population of the excited states in the arc periphery with respect to the equilibrium values, axial dependence of the off-axis maximum of the radial emission coefficient of Ar I at 696.5 nm, and enhanced population of the Ar (1s4) resonance level due to trapping of resonance radiation in the arc periphery are considered.