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根据条件矩模型(CMC)和小火焰面模型在模型构建上的相似,针对具有不同大小雷诺数和湍流-化学相互作用特性的非预混湍流射流火焰,对这两种模型进行了数值研究和比较.湍流燃烧模型采用Lagrangian型非稳态小火焰模型(LFM)和径向加权积分的CMC模型,而在H2/N2火焰的数值研究中还考虑了稳态小火焰模型的数值模拟结果.数值结果表明,在两种火焰中这两种模型对主要组分的预测结果较为一致并与实验符合较好,而OH和NO的预测值差异明显;同时对于具有局部熄火特性的CH4/H2/N2火焰,NO的预测值被高估了2～3倍.
According to the similarity of model building of CMC model and small flame surface model, the two models are studied numerically for non-premixed turbulent jet with different size Reynolds number and turbulence-chemical interaction The turbulent combustion model uses the Lagrangian unsteady small flame model (LFM) and the radial weighted integral CMC model, while the numerical simulation of the steady-state small flame model is also considered in the numerical study of the H2 / N2 flame. The results show that the predictions of the two components are consistent and agree well with the experimental results, but the predicted values of OH and NO are obviously different. In the meantime, for the CH4 / H2 / N2 Flame, the predicted value of NO is overestimated by 2 to 3 times.