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Abstract <p>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 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{N}}{{{\text{O}}}_{x}}\)</EquationSource> <!--CESW2670003Slastnaya-m1--> </InlineEquation> is observed. This effect of enhanced <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\text{N}}{{{\text{O}}}_{x}}\)</EquationSource> <!--CESW2670003Slastnaya-m2--> </InlineEquation> formation disappears in the near-wall region further downstream.</p>

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Numerical Simulation of NOx Formation in a Premixed Methane–Air Flame near a Cold Wall

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • D. A. Slastnaya,
  • M. Yu. Hrebtov,
  • R. I. Mullyadzhanov,
  • V. M. Dulin

摘要

Abstract

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 \({\text{N}}{{{\text{O}}}_{x}}\) is observed. This effect of enhanced \({\text{N}}{{{\text{O}}}_{x}}\) formation disappears in the near-wall region further downstream.