Performance eva‎luation of the unstrained Flamelet Generated Manifold combustion model for simulating a piloted premixed flame subjected to extreme levels of turbulence using Large Eddy Simulation approach

11/19/2025 12:00:00 AM

In this study, the behavior of a turbulent premixed flame in the severe turbulence regime is investigated using the Large Eddy Simulation (LES) approach an‎d the Flamelet Generated Manifold (FGM) combustion model. The aim of this study is to eva‎luate the ability of the FGM model to predict the flame structure, reaction front position, an‎d velocity field under conditions where the turbulence intensity is very high an‎d the Karlowitz number is in a large range. First, a comprehensive review of the theoretical foundations of laminar an‎d turbulent flames an‎d the effect of turbulence parameters on flame behavior was conducted. Then, the numerical modeling process including equation discretization, boundary conditions, an‎d the method of creating the developed inlet field were described. In order to be more realistic, the simulation process was carried out in three stages: simulation of the developed flow in the pipe, the mixing zone, an‎d finally the reaction zone. The simulations were conducted on the University of Sydney pilot burner, which consists of two concentric tubes with internal diameters of 2.5 an‎d 7.5 mm. In this condition, the central flow was injected at a velocity of 216 m/s an‎d the annular flow at a velocity of 88 m/s. Comparison of the numerical results with experimental data showed that the FGM model was able to reproduce the velocity field an‎d vortex structure with high accuracy an‎d predict the location of flame formation in a physically correct manner. The main innovation of this research is the application of the FGM model in the severe turbulence regime; a domain that had been less studied before. In addition to accurately predicting the flame position, the developed model was able to provide a suitable description of the mixing behavior an‎d turbulence dynamics. Based on the results obtained, it can be concluded that the combination of the FGM model with the LES approach is a powerful tool for simulating premixed flames in complex turbulent conditions

شعله پيش آميخته , توربولانس شديد , رهيافت شبيه سازي گردابه بزرگ , آشفتگي

Premixed flame, , extreme turbulence , large eddy simulation approach , turbulence

Mohammad Habibi Mansourabad

Hojat Ghassemi