Conditional moment closure and transient flamelet modelling for detailed structure and NO x formation characteristics of turbulent nonpremixed jet and recirculating flames
Conditional moment closure and transient flamelet modelling for detailed structure and NO x formation characteristics of turbulent nonpremixed jet and recirculating flames
复制标题
湍流非预混射流和循环火焰的详细结构和 NO x 形成特征的条件矩闭合和瞬态小火焰建模
DOI：
10.1080/13647830600985297
复制
发表时间：
2007
影响因子：
1.3
通讯作者：
M. Cleary
中科院分区：
文献类型：
--
作者：
G. Kim;S. Kang;Y. Kim;R. Bilger;M. Cleary
本研究的主要动机是评估计算和理论上的条件矩封闭（CMC）模型和瞬态火焰模型的湍流非预混火焰的模拟。这两个湍流燃烧模型被实现到非结构网格有限体积法，有效地处理物理和几何复杂的湍流反应流。此外，并行算法已被实现，以提高计算效率，以及减少CMC过程的内存负载。实例包括两个湍流CO/H2/N2射流火焰具有不同的流动时间尺度和湍流非预混H2/CO火焰稳定的轴对称钝体燃烧器。采用拉格朗日火焰面模型和简化的CMC公式对强抛物射流火焰进行了计算。另一方面，欧拉粒子火焰面模型和完全保守的CMC公式被用于流动回流的钝体火焰。基于数值计算结果，从火焰结构和NOx生成特性两个方面对两种燃烧模型的性能进行了比较。
This study has been mainly motivated to assess computationally and theoretically the conditional moment closure (CMC) model and the transient flamelet model for the simulation of turbulent nonpremixed flames. These two turbulent combustion models are implemented into the unstructured grid finite volume method that efficiently handles physically and geometrically complex turbulent reacting flows. Moreover, the parallel algorithm has been implemented to improve computational efficiency as well as to reduce the memory load of the CMC procedure. Example cases include two turbulent CO/H2/N2 jet flames having different flow timescales and the turbulent nonpremixed H2/CO flame stabilized on an axisymmetric bluff-body burner. The Lagrangian flamelet model and the simplified CMC formulation are applied to the strongly parabolic jet flame calculation. On the other hand, the Eulerian particle flamelet model and full conservative CMC formulation are employed for the bluff-body flame with flow recirculation. Based on the numerical results, a detailed discussion is given for the comparative performances of the two combustion models in terms of the flame structure and NO x formation characteristics.