超音速等离子体炬的数值模拟

介绍了描述大气压下超音速等离子体炬内等离子体特性的磁流体力学模型，在二维近似下，对会聚-扩展型喷口等离子体炬进行了数值模拟，获得了等离子体炬内等离子体速度、温度、压力以及马赫数的分布.结果表明超音速等离子体炬内的流场特性可以分为亚音速、跨音速和超音速三个明显的区域. 关键词： 等离子体炬 磁流体力学 数值模拟

Numerical study of supersonic plasma torch

The magnetic hydrodynamics(MHD) model which is used to describe the heat and fluid flow inside the plasma torch under atmosphere condition was presented. Numerical simulation of the plasma torch with convergence-divergence nozzle shape was carried out by using a two-dimensional mathematical model. Plasma temperature, velocity, pressure, Mach number contours,which describe the characteristic of heat and fluid flow inside the plasma torch, were obtained. Results show that the plasma field can be divided into three regions named subsonic region, transonic region, and the supersonic region.