氩等离子体射流在空气环境中冲击平板层流流动与传热的数值模拟

MODELING OF A LAMINAR ARGON PLASMA JET IMPINGING ON A FLAT PLATE IN AIR SURROUNDINGS

本文采用组合扩散系数方法处理不同气体组分之间的扩散，对氩等离子体的流射入空气环境并撞击平板时的层流流动和传热进行了数值模拟．这种新的处理混合气体中质量扩散的方法有助于更准确地描述等离子体条件下的组分扩散与能量输运。文中给出了射流中速度、温度及氩质量分数的分布情况，以及基板处热流密度分布的若干典型的数值模拟结果．

Modeling results are presented of the laminar flow and heat transfer for an argon plasma jet impinging on a fiat plate located in air surroundings. Computed velocity and temperature profiles at the torch outlet obtained from the modeling of the plasma torch have been employed as the boundary conditions at the jet inlet, and the combined diffusion coefficient method has been used to treat the species diffusion. This approach is believed to be more accurate to describe the species diffusion and the energy transport for the present case. Computed results are given for the velocity, temperature and argon mass fraction distributions in the jet, and for the heat flux and pressure distributions on the surface of the flat substrate.