A model of fluid, heat flow, and electromagnetic phenomena in a nontransferred arc plasma torch
A model of fluid, heat flow, and electromagnetic phenomena in a nontransferred arc plasma torch
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DOI：
10.1063/1.349238
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发表时间：
1991-10
影响因子：
3.2
通讯作者：
R. Westhoff;J. Szekely
中科院分区：
文献类型：
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作者：
R. Westhoff;J. Szekely
提出了一个数学模型来描述电磁，热流，和流体流动的现象内的非转移弧等离子体炬和所产生的羽流。在模型的发展津贴是为质量，动量，热能和电流的连续性守恒。该模型的一个重要的，新颖的特点是，它可以预测的模式内的火炬和电磁力的热生成，从而提供了一个基本的基础上预测羽流行为。对于纯氩系统（即，放电到氩环境中的氩等离子体），以层流模式操作，并且理论预测似乎与实验测量相当一致。一个重要的发现的工作是，电磁力可以显着修改的速度分布，并可能显着影响的等离子体气体离开火炬的漩涡。此外，涡流被证明有一个显着的影响上的行为的电弧，从而影响所产生的羽流。
A mathematical model is presented to describe the electromagnetic, heat flow, and fluid flow phenomena within a nontransferred arc plasma torch and in the resultant plume. In the development of the model allowance is made for the conservation of mass, momentum, thermal energy, and the continuity of the current. An important, novel feature of the model is that it can predict both the pattern of heat generation within the torch and the electromagnetic forces, thus providing a fundamental basis for predicting plume behavior. Specific calculations are presented for a pure argon system (i.e., an argon plasma discharging into an argon environment), operating in a laminar mode, and the theoretical predictions appear to be in quite good agreement with experimental measurements. An important finding of the work is that the electromagnetic forces may markedly modify the velocity profiles and may significantly affect the swirl of the plasma gas exiting the torch. In addition, swirl is shown to have a significant affect on the behavior of the arc and thus affects the resulting plume.