摘要：基于甲烷-空气火焰法合成纳米颗粒的实验,建立了二维轴对称湍流火焰模型,在标准壁面函数和非平衡壁面函数的近壁面处理条件下采用RSM、Standard k-ε和RNG k-ε湍流模型对实验中的火焰进行数值模拟,给出了火焰温度场和火焰长度的数值计算结果。通过与实验结果对比,确定了用非平衡壁面函数下的RNG k-ε湍流模型进行火焰数值计算的合理性。用此模型对不同甲烷、空气流速下的火焰进行模拟,分析了影响温度场分布的主要因素,并与实验结果进行比较,两者相符,从而证明了该模型的有效性。
关键词：纳米颗粒；湍流扩散火焰；湍流模型；数值计算
Abstract：Based on the experiment of nano-particle synthesized by flame,the 2D axisymmetrical model was established.RSM、Standard k-ε and RNG k-ε turbulent models were used to simulate the flame of ex-periment in standard wall functions condition and non-equilibrium wall functions condition.The simulation results of different models with different flame length and temperature profile were studied.Comparing the simulation with the flame observed in experiments,the results of discussion showed that using the RNG k-ε turbulent model in non-equilibrium wall functions to do numerical calculation of flame was reasonable.The various velocity flame of CH4 and air were calculated,and the important factor of flame length and temperature profile was discussed.The simulation and experiment were consistent,and the model was proved to be reasonable.
Keywords：nano-particles;turbulent diffusion flame;turbulent model;numerical calculation
