大气压射频感应等离子体热流场及涡流形态数值计算研究

Atmospheric pressure RF thermal plasma has been widely used in powder spheroidization, ablation-resistant coating spraying, and nano-powder synthesis in recent years due to its high specific enthalpy, low flow rate, and negligible electrode contamination. First, an atmospheric pressure argon RF thermal plasma simulation model is established based on a two-dimensional axisymmetric magneto–fluidic equation system. Then, the plasma temperature, velocity fields, Joule heat, radiation dissipation, and Lorentz force distribution characteristics in the discharge tube under different working conditions and structural parameters are studied. Subsequently, the critical flow rate of the central gas required for transforming the vortex pattern under different coil powers, discharge frequencies, inner diameters of the central tube, and exit positions is calculated. The study results provide an important theoretical basis for the selection of RF thermal plasma operating parameters and the design of the center tube powder supply system.