氩氦等离子体电弧特性的数值模拟

Numerical Simulation of Arc Properties in Argon and Helium Plasmas

应用ANSYS软件对氩、氦等离子体电弧进行了数值模拟。通过前处理、求解、后处理,分别模拟了氩弧和氦弧的电弧温度分布。通过比较氩弧和氦弧温度场发现,氦弧的径向距离明显收缩。模拟结果表明:氩弧温度场分布呈钟罩形,而氦弧呈球形;氦弧的最高温度小于氩弧,但氦弧的平均温度高于氩弧。等离子体的热力学与输运性质不同是造成以上差异的主要原因。

The software of ANSYS was used to simulate the argon arc and helium arc. By pre-processing, solution, after treatment, the arc shape of argon and helium was simulated. The comparison of the distribution of temperature field between argon and helium ares shows that the helium arc is more constricted than the argon arc in the radial distance. The numerical results show that：the helium arc does not have the bell shape typical of argon TIG arcs, it is spherical; while the maximum temperature of helium are is lower than that of argon arc, but the average temperature of helium arc is higher than that of argon are. The results are explained by referring to the thermodynamic and transport properties of the argon and helium plasmas.