【摘要】 为同时满足工程应用中的合理性和经济性 ,提出了一种简化的联合三维高斯分布的 PDF模型 ,将其用于后台阶突扩燃烧室中甲烷燃烧的数值模拟。由于充分考虑了组分浓度、温度的一阶矩以及它们的二阶自关联矩和互关联矩对化学反应速率的影响 ,得到的火焰形状和温度分布无论是定性还是定量上都比 EBU模型和 Arrhenius模型合理。因计算量较小 ,模型在工程实际中 ,特别是污染物生成的数值模拟中得到应用更多还原

【Abstract】 The mean reaction rate in the frame of averaging approach is closed using the joint presumed PDF (possibility distribution function) model of turbulent combustion, in which the joint PDF of the reactant concentration and temperature is assumed to have a three dimensional Gaussian distribution. The model was verified by experimental data of premixed turbulent combustion of a sudden expansion flow. The results show that the joint PDF model is better than the Arrhenius and EBU models. Furthermore, it is suitable for most engineering applications since it is less expensive computationally, especially for the simulation of pollutant emissions.更多还原