非均匀入流部分预混射流火焰的大涡模拟

Large Eddy Simulation of Partially Premixed Jet Flame with Inhomogeneous Inlet

针对部分预混火焰的大涡模拟(LES)问题,通过采用基于反应-扩散流形(REDIM)方法和假定滤波概率密度函数(PFDF)构造的REDIM-PFDF亚网格燃烧模型,对悉尼大学及Sandia实验室联合测量的非均匀射流部分预混火焰(FJ200-5GP-Lr75-57)进行了大涡模拟研究.随后对该状态的火焰及流场结构进行了分析,并将计算结果与实验数据进行对比,研究表明,在所研究的部分预混火焰工况下,大涡模拟预测得到的温度、CO2、CO等组分与实验值吻合良好.这也进一步验证了REDIM-PFDF模型在计算部分预混燃烧方面的能力.

In this study,we performed large eddy simulations (LES) of turbulent partially premixed combustion.Specifically,we used the REDIM-PFDF sub-grid combustion model based on the reaction-diffusion manifold (REDIM) and presumed filtered density function (PFDF) to calculate the turbulent partially premixed flame FJ200-5GP-Lr75-57 with inhomogeneous inlet,which was jointly measured by the University of Sydney and San-dia Laboratory.We analyzed the flame and flow field structures in this state,and compared the LES results with experimental data.The results show that the LES predicted temperatures and CO 2 and CO mass fractions were in good agreement with the experimental data,which demonstrates the capability of the REDIM-PFDF combustion model in simulating partially premixed flames.