应用PDF方法对甲烷射流火焰组分浓度分布的数值研究

NUMERICAL STUDY OF RADIAL DISTRIBUTION OF COMPOSITION OF METHANE TURBULENT JET FLAME BY PDF METHOD

本文用k-ε模型和PDF方程相结合的方法对甲烷湍流射流扩散火焰进行了求解，发现Peters等提出的四步反应模型在径向分布预示性能不好，本文对甲烷射流扩散火焰的实际工况进行了分析，提出反应模型的改进方案。改进后的模型所给出的组分浓度分布比原四步反应模型更符合实验结果。验证了修正模型所依据的思想．

Methane turbulent jet flame is simulated with the combination of k-ε model and PDF method. It is found that four-step reaction model proposed by Peter is unsatisfactory in predicting radial distribution of composition. A revised model is presented based on the analysis of practical case. It is shown that the computational results obtained from the revised model are more agreeable with experiment data than those of Peters' model. The feasibility of revised model is proved.