超高压低强度无氩燃烧电弧放电的理论与实验研究

E. Izquierdo, J. González-Aguilar, L. Fulcheri
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引用次数: 6

摘要

本文研究了一种低电流强度、极高压(pgt105pa)自由燃烧氩弧尖顶结构放电。建立了二维轴对称双温流体模型。该模型包含三种化学物质(e, Ar, Ar+),适当的热力学和输运性质表示为电子和重温度和压力的函数,以及电极鞘子模型。在0.1 ~ 10mpa和0.1 ~ 500ma的压力范围内,对理论结果进行了比较。在非常高的压力和低的电流强度下获得最高电压。理论模型表明,压力增加会导致弧径减小。这是由于电弧边缘的自然对流增加了径向热损失,以及由于中性电子碰撞带来更好的能量传递而产生的传导。令人惊讶的是,高压条件似乎对电弧放电有稳定作用。
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Theoretical and experimental study of an argon free burning arc dicharge at very high-pressure and low-intensity
This paper deals to study a low current intensity, very high-pressure (PGt105 Pa) free-burning argon arc discharge in a tip-tip configuration. A 2D axisymmetric two-temperature fluids model has been developed. The model contains three chemical species (e, Ar, Ar+), the appropriated thermodynamics and transport properties expressed as a function of electron and heavy temperatures and pressure, and the electrodes sheath submodel. Theoretical results were compared with experimental data obtained under pressure comprised between 0,1 to 10 MPa and 0.1 to 500 mA. Highest voltages are obtained at very high pressures and low current intensities. Theoretical model indicates that pressure increment causes an arc diameter reduction. This is due to the augmentation of radial heat losses by natural convection at arc fringes and by conduction due to a better energy transfer by neutral- electrons collisions. Surprisingly, the very high-pressure conditions seems having a stabilizing effect on the arc discharge.
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