氩气感应耦合等离子体速度与温度数值模拟

Numerical simulation of velocity and temperature fields of the argon inductively coupled plasma

为了获得用于研究再入飞行器热防护系统的感应耦合等离子体风洞流场数据,基于流场、电磁场和化学场的多场耦合建立了非平衡态感应耦合等离子体数值模型。利用该模型对不同入口质量流率和不同工作压力下的感应耦合等离子体进行了数值模拟,得到了相应工作参数下感应耦合等离子体温度与速度的分布特性。计算结果表明:等离子体中心线上的速度随着入口质量流率的增大而增大,而随着工作压力的增大而减小;同时,等离子体中心线上的温度随着入口质量流率的增大而减小,而随着压力的增大先减小后增大。这些结果可为感应耦合等离子体风洞优化设计及其工业应用提供理论指导。

In order to obtain the flow-field properties of the inductively coupled plasma wind tunnel(ICPWT)for the research of the thermal protection system(TPS)of re-entry vehicles,a non-equilibrium numerical model with the coupling of flow-field,electromagnetic-field and chemical-field was established to simulate radio-frequency discharge,Joule heating phenomenon and ionization/dissociation chemical process of an ICP flow.Distribution characteristics of flow velocity and temperature were obtained and analyzed under different inlet mass flow rates and different working pressures.Calculation results show that the velocity on the center line of the plasma torch increases with the increase of the inlet mass flow rate,but decreases with the increase of the working pressure.At the same time,the temperature on the center line of the plasma torch decreases as the inlet mass flow rate increases.However,the temperature decreases first,and then increases as the pressure increases.This research will provide reference for the optimal design of high thermal efficiency ICP torch and guidance for industrial applications of the inductively coupled plasmas.