Numerical Simulation of the Voltage–Current Characteristic of an Atmospheric Pressure Discharge: The Glow-to-Arc Transition

IF 2.6 3区物理与天体物理 Q3 ENGINEERING, CHEMICAL

Plasma Chemistry and Plasma Processing Pub Date : 2024-01-03 DOI:10.1007/s11090-023-10438-4

E. Cejas, L. Prevosto, F. O. Minotti

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Abstract

The glow-to-arc transition of a convection-stabilized atmospheric pressure air discharge is numerically investigated. Two separate models are considered: a one-dimensional axisymmetric time-dependent fluid model of the positive column, describing the thermal-instability, and a sheath model of a cold cathode describing the field-emission instability, which must then be properly matched together. The fluid model considers the most important chemical reactions in air plasma, including thermal ionization in atomic collisions. The radial electric field in the plasma is obtained from the Poisson equation. The voltage–current characteristic of the discharge is simulated for a time-varying current up to 300 mA. It is found that at some critical value slightly above 200 mA, the contraction of the positive column arises from a vibrational–translational energy relaxation. The subsequent increases in the discharge current density in the positive column drive in turn a field-emission instability in the cathode, which is accompanied by a large voltage drop. Simulation results are validated against available experimental data.

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大气压力放电的电压-电流特性数值模拟：辉光到电弧的转变

对对流稳定的大气压空气放电的辉光到电弧的转变进行了数值研究。研究考虑了两个独立的模型：描述热不稳定性的正柱一维轴对称随时间变化的流体模型，以及描述场发射不稳定性的冷阴极鞘模型。流体模型考虑了空气等离子体中最重要的化学反应，包括原子碰撞中的热电离。等离子体中的径向电场由泊松比方程求得。模拟了高达 300 mA 的时变电流的放电电压-电流特性。结果发现，在略高于 200 mA 的临界值时，正极柱的收缩是由振动-翻译能量弛豫引起的。正极柱中放电电流密度的增加反过来又推动了阴极的场发射不稳定性，并伴随着巨大的电压降。模拟结果与现有实验数据进行了验证。

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来源期刊

Plasma Chemistry and Plasma Processing 工程技术-工程：化工

CiteScore

5.90

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.