中文摘要：

本文应用大气压等离子体射流传热与流动的三维数学模型,在相同初始条件下,计算得到了采用不同湍流模型时氩等离子体射流对称轴线上的温度、速度及空气质量分数分布,并与文献中同等条件下的实验结果进行了比较,结果表明采用标准k-ε模型和Realizable k-ε模型时与实验结果相差较大,而采用RNG k-ε湍流模型时模拟结果与实验数据更为接近。不同湍流模型时射流核心区的温度和速度分布与实验结果的比较表明,采用RNG k-ε湍流模型模拟热等离子体射流的传热和流动,更能体现等离子体射流核心区层流特性这一物理本质。

英文摘要：

A three-dimensional model is applied to predict the temperature,velocity and air concentration on the axis of an argon plasma jet.Calculated results of three different turbulence models are compared with the experimental results under the same operating conditions.The results indicates that the RNG k—εturbulence model agree well with the experiment data,Distributions of temperature,velocity and concentration of the jet core area are also simulated for three different turbulence models.The results show that the RNG k—εturbulence model is able to simulate the laminar characteristics of the jet core,while the other models overestimate the turbulence in the jet.