Influence of the Surface Structure on the Anode Boundary of High Current Moving Arcs in Atmosphere
Influence of the Surface Structure on the Anode Boundary of High Current Moving Arcs in Atmosphere
复制标题
表面结构对大气中大电流动弧阳极边界的影响
DOI：
10.1007/s11090-015-9651-8
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发表时间：
--
影响因子：
3.6
通讯作者：
Schein
中科院分区：
文献类型：
--
作者：
Kirner;Forster;Schein
本文研究了大气中强电弧阳极边界的表面结构的影响。有人发现，阳极的表面结构有显着的影响，阳极下降电压，我们声称可以引起的场增强。所测试的阳极材料为铜。为了产生由微峰诱导的不同的场增强表面结构，对样品进行了不同粒度的喷砂处理。对于场的确定，提出了一种新的方法，并定义了场增强因子。这是通过用理想峰近似样品表面来完成的，其高度使用粗糙度计算，其基底基于SEM图像计算。已知峰的几何形状，可以模拟电场，然后计算场增强因子。制备的样品进行了测试与TIG类等离子体应用不同的参数。当移动电弧穿过准备好的样品时，通过并行高速立体图像采集进行电压和电流测量。使用所测量的电弧电压、所计算的场和Child-Langmuir定律的修改形式，可以计算阳极电压降。为了验证创新的方法，朗缪尔探针测量进行。计算结果符合得很好，证明了用于确定场增强的方法和基于Child-Langmuir定律的物理模型是有用的近似。
In this study the influence of the surface structure on the anode boundary of high intensity arcs in atmosphere is investigated. It was found that the surface structure of an anode has a significant influence on the anode fall voltage, which we claim can be caused by field enhancements. The tested anode material is copper. In order to produce different field enhancing surface structures induced by micro peaks, the samples are sandblasted with different grain sizes. For the determination of the field a new method is proposed and a field enhancement factor is defined. This is done by approximating the sample surfaces with ideal peaks, whose height is calculated using the roughness and whose base is calculated based on SEM-images. Knowing the geometry of the peaks it is possible to simulate the electric field and then calculate the field enhancement factor. The prepared samples are tested with TIG-like plasmas applying different parameters. While moving the arc across a prepared sample, voltage and current measurements take place with parallel high speed stereo image acquisition. Using the measured arc voltages, the calculated fields and a modified form of the Child-Langmuir law, it is possible to calculate the anode drop voltage. To verify the innovative method, Langmuir-probe measurements are performed. The results are in good agreement and are evidence that the method used for the determination of the field enhancement and the physical model based on the Child-Langmuir law are useful approximations.
TIG 焊接电弧向工件的热流
DOI：
10.1088/0022-3727/6/18/310
发表时间：
1973
期刊：
Journal of Physics D
影响因子：
--
作者：
M. Quigley;P. H. Richards;D. Swift;A. Gick
通讯作者：
A. Gick