Flow Characteristics Of Plasma Arc Heating

In this paper, numerical simulation of the heat transfer and flow in a free-burning air arc is based on the magnetic vector potential description. Through the write of source terms realizing the flow field and the electromagnetic field coupling calculation. In addition, the author considers the influence of cathode melting and anode evaporation, making the calculation results more tally with the actual situation. This paper expounds the basic arc forming mechanism, for an industrial application of electric arc is of great significance.Then, here introduces a kind of a laval nozzle, on the basis of2d rotational symmetry model, numerical simulation has been taken for the plasma flow in the plasma torch and outside. In this paper, the internal nozzle based on the magnetic vector potential MHD model, avoiding the complex integral calculation of self induction magnetic field intensity, achieving the nozzle internal field coupling and external jet flow state. Analysis of the nozzle internal electromagnetic field on plasma acceleration and jet development process, for supersonic plasma torch industrial application provides a theoretical basis. On the basis of the former study, in view of the existing water circulation system in the supersonic plasma torch is relatively complex leading the laval anode nozzle difficult to change. So we design a simple structure, low cost, easy disassembling leak detection, electrode water-cooling integration and anode easy replacement of supersonic plasma torch.At last, numerical simulation has been taken for the plasma flow in the plasma torch and outside under different arc root position. In this paper, the internal nozzle is based on the magnetic vector potential MHD model,. By using the method of virtual anode, we obtained the results of the field coupling inside and external jet flow state under different arc root position. Analysis of the plasma flow characteristic under different arc root position, for dual-anode supersonic plasma torch industrial application provides a theoretical basis. And designed a kind of simple structure, reliable, low cost, miniaturization of the dual anode supersonic plasma torch.