This paper presents the results of direct numerical simulations of combustion in a conical methane–air flame impinging on a cold flat wall. Three cases with different distances between the burner nozzle and the wall are considered. The study focuses on nitrogen oxide formation in the near-wall region. It has been established that when the wall is located at a distance of three nozzle diameters from the nozzle exit, a recirculation zone is formed between the conical flame front and the cold wall, where an increased concentration of nitrogen oxides N{{O}ₗ} is observed. This effect of enhanced N{{O}ₗ} formation disappears in the near-wall region further downstream.
Slastnaya et al. (Wed,) studied this question.