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火焰面模型已被广泛应用于层流和湍流火焰的模拟中,然而对包含多种火焰机制的复杂燃烧场,针对单一火焰机制的一维层流火焰面模型不能准确地还原其内部的火焰结构特征。为了解决以上问题,基于由Nguyen等提出的多维火焰面生成流形方法(MFM),发展了一种新的交互迭代式Z-C多维火焰面模型。通过层流抬举火焰的模拟,以直接求解详细化学反应的DNS解为参照解,以确定新模型的模化精度,并与一维预混火焰面生成流形方法(premixed FGM)进行了对比。通过对不同模型解的分析可以得出,相比于只能捕捉一种火焰特征的一维火焰面模型,多维火焰面模型可以同时捕捉多机制火焰结构中的扩散和预混特征。使用新的多维火焰面模型求解可以在计算量减小一个数量级的前提下,得到接近DNS参照解的模型精度。
The flame surface model has been widely used in the simulation of laminar and turbulent flames. However, for complex combustion fields with multiple flame mechanisms, the one-dimensional laminar flame model for a single flame mechanism can not accurately restore the internal flame structure feature. In order to solve the above problems, a new interactive iterative Z-C multi-dimensional flame surface model is developed based on the multi-dimensional flame surface generation manifold method (MFM) proposed by Nguyen et al. Laminar flow was used to simulate the flame and the DNS solution of the detailed chemical reaction was directly used as a reference solution to determine the accuracy of the new model and compared with the one-dimensional premixed FGM. By analyzing the different model solutions, it can be concluded that the multi-dimensional flame surface model can simultaneously capture the diffusion and pre-mixing features in a multi-mechanism flame structure compared to a one-dimensional flame surface model that can only capture one type of flame. Using the new multidimensional flame surface model solver yields a model accuracy close to the DNS referential solution with an order of magnitude less computations.