Plasma chemistry in the free-burning Ar arc
Plasma chemistry in the free-burning Ar arc
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DOI：
10.1088/0022-3727/46/32/325202
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发表时间：
2013-08-14
影响因子：
3.4
通讯作者：
Uhrlandt, D.
中科院分区：
文献类型：
--
作者：
Baeva, M.;Uhrlandt, D.
最近的野心已经瞄准了在氩气中的自由燃烧电弧的建模，通过电弧等离子体和电极的自洽描述，避免假设的平衡。作为下一步，目前的工作涉及非平衡建模中使用的反应化学的影响。一组反应解释了弹性散射、与电子和原子碰撞中的激发和去激发、逐步电离、复合和自发辐射。一个简单的化学模型的基础上的迅速电离的近似，一个有效的激发能级的模型，和一个模型意味着更高的激发能级的氩原子被认为是。结果表明，这三种模型都能较好地预测电弧特性。它们提供彼此接近的电流密度、电导率、电弧电压、电子和重粒子温度值。简单的模型可以作为一个快速通道的电弧特性的评估，并为模型参数的影响敏感的研究。扩展的模型允许获得人口的个人和有效的水平引起重要的辐射跃迁。
Recent ambitions have been aimed at modelling of a free-burning arc in argon by means of a self-consistent description of the arc plasma and the electrodes avoiding assumptions of equilibrium. As a next step, the present work deals with the impact of the reaction chemistry used in non-equilibrium modelling. A set of reactions accounts for elastic scattering, excitation and de-excitation in collisions with electrons and atoms, step-wise ionization, recombination and spontaneous emission. A simple chemistry model based on the approximation of prompt ionization, a model with an effective excited level, and a model implying higher excited levels of argon atoms are considered. The results obtained show that all three models are capable of predicting the arc characteristics. They deliver values of electric current density, electric conductivity, arc voltage, electron and heavy particle temperature which are close to each another. The simple model can serve as a fast-track evaluation of the arc characteristics, and for sensitive studies of the impact of model parameters. The extended model allows obtaining the populations of individual and effective levels giving rise to important radiative transitions.