电弧的有限体积模拟：高频交变纵向磁场箍缩电弧等离子体
Finite volume simulation of arc: pinching arc plasma by high-frequency alternating longitudinal magnetic field
摘要：
电弧等离子体在许多领域有着广阔的应用前景。探索他们的财产是有趣的。本文详细介绍了基于压力的氩弧有限体积模拟。在模拟中，整个阴极区域耦合到电磁计算，以保证在阴极表面的电流密度的自由变化。在数值求解中，采用迎风差分格式保证对流项的输运性质，采用SIMPLE（Semi-Implicit Method for Pressure Linked Equations）算法求解热压。通过对自由燃烧氩弧的数值模拟，表明该模型与实验结果吻合较好。在高频交变纵向磁场中观察到氩弧的集中现象。与现有的收缩机构不同，这里的电弧通过收缩和膨胀之间的连续过渡来实现收缩。其机理是外加高频交变磁场与电弧的运动惯性共同作用，能够有效地起到“等离子体陷阱”的作用，使电弧等离子体被囚禁在一个较窄的空间内。这为压缩电弧提供了一种新的途径。
英文摘要：
Arc plasmas have promising applications in many fields. To explore their property is of interest. This paper presents detailed pressure-based finite volume simulation of argon arc. In the modeling, the whole cathode region is coupled to electromagnetic calculations to promise the free change of current density at cathode surface. In numerical solutions, the upwind difference scheme is chosen to promise the transport property of convective terms, and the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm is used to solve thermal pressure. By simulations of the free-burning argon arc, the model shows good agreement with experiment. We observe an interesting phenomenon that argon arc concentrates intensively in the high-frequency alternating longitudinal magnetic field. Different from existing constricting mechanisms, here arc achieves to be pinched through a continuous transition between shrinking and expansion. The underlying mechanism is that via collaborating with arc's motion inertia, the applied high-frequency alternating magnetic field is able to effectively play a "plasma trap" role, which leads the arc plasma to be imprisoned into a narrower space. This may provide a new approach to constrict arc.
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