Numerical study of heat transfer for a laminar Bunsen flame impinging on a flat surface

This article presents the results of numerical simulation of heat transfer between a laminar axisymmetric methane/air flame and a cold flat wall. The simulation is performed for different distances between the nozzle exit and the surface, namely, for one, two, and three burner nozzle diameters. The flow evolution is calculated by the direct numerical simulation method with a detailed kinetic mechanism GRI-MECH 3.0. At a distance of three diameters, there is a significant reduction of heat flux close to the stagnation point due to a local recirculation zone formation between the flame cone and the wall. This phenomenon explains the observed decrease in local heat transfer. The obtained numerical results well agree with the previous flame study by planar optical methods.