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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。
Based on the three-dimensional mathematical model of heat transfer and flow of atmospheric plasma jet, the temperature, velocity and air mass fraction distribution on the symmetry axis of argon plasma jet with different turbulence models are calculated under the same initial conditions. The experimental results under the same conditions are compared. The results show that there is a big difference between the experimental results and the standard k-ε model and the Realizable k-ε model. The simulation results are more similar to the experimental data when the RNG k-ε turbulence model is adopted. Comparison of the temperature and velocity distributions in the core of the jet with different turbulence models and the experimental results shows that using the RNG k-ε turbulence model to simulate the heat transfer and flow of the thermal plasma jet can better reflect the laminar flow characteristics in the core of the plasma jet Physical essence.