The interaction between graphite particles and argon plasma in the arc torch is investigated by numerical simulations. The addition of carbon vapor improves the specific heat capacity, electrical conductivity and thermal conductivity of plasma, and decreases its viscosity. It is important to note that the changes in the thermodynamic and transport properties of the plasma substantially affect the arc plasma temperature and the spatial distribution of the carbon vapor concentration. As the graphite particle feed rate increases, the arc will be continuously contracted and the arc electric current density will be increased. The carbon vapor enhances the plasma electrical conductivity, but the heat absorption by the particles reduces the temperature of the plasma, eventually leading to decreased the electrical conductivity. Both result in ascent of the electric field of the arc, so that increase the arc voltage. In addition, the heat flux radial distribution of radiation-absorption of the particles is much less than the thermal conduction, but the particles near the wall absorb radiation from arc region, so that reduce energy loss of the radiation of the arc column.

通过数值模拟研究了电弧炬中石墨颗粒与氩等离子体之间的相互作用。碳蒸气的添加改善了等离子体的比热容，电导率和热导率，并降低了其粘度。重要的是要注意，等离子体的热力学和传输性质的变化会大大影响电弧等离子体的温度和碳蒸气浓度的空间分布。随着石墨颗粒进料速率的增加，电弧将连续收缩，电弧电流密度将增加。碳蒸气增强了等离子体的电导率，但是颗粒吸收的热量降低了等离子体的温度，最终导致电导率降低。两者都导致电弧电场的上升，从而增加了电弧电压。另外，粒子的吸收辐射的热通量径向分布比热传导小得多，但是壁附近的粒子吸收来自电弧区域的辐射，从而减少了电弧塔的辐射的能量损失。