Numerical Simulation, The Arc Temperature Field, Velocity Field And Radiation Effects Of The Helical Instability

The discharge voltage of arc plasma is very low, about 10-100V, but the current is very high, about 0.1-1000A or more. There are strong light and heat between the electrodes. The characteristics of arc such as high temperature, concentrated energy, easily control and so on make arc applied in wide fields.My paper includes two parts.In the first part, the SIMPLE algorithm is used to solve the MHD equations and the solutions of MHD equations are presented for the whole free-burning arc, excluding the electrodes. The SIMPLE algorithm has been revised in order to solve MHD equations, and the flow chart is showed. A self-consistent numerical solution of the MHD equations yields the temperature and velocity distributions. And different types of radiation term are examined on the numerical results and it is found that the radiation term redults in a small decrease on the temperature of the arc.In the second part, the yan jingxiang shuangtongliang model for radiation and the linear time perturbation theory are used in this paper, and the helical magnetic instability is analysed in an axial magnetic field. The marginal Maecker's number and the growth rate of the helical instability are given. The numerical results show that the radiation term redults in a small decrease on the temperature of the arc for the low current arc.