Theoretical and numerical analysis of oscillating diffusion flames

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• 作者：Milan Miklavčič ; ^a ; ^{milan@math.msu.edu" class="auth_mail" title="E-mail the corresponding author} ; Indrek S. Wichman^b ; ^{wichman@egr.msu.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Diffusion flames ; Oscillations ; Coflow slot burners ; Theoretical analysis ; Burke&ndash ; Schumann model ; Infinite-rate chemistry
• 刊名：Combustion and Flame
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：173
• 期：Complete
• 页码：99-105
• 全文大小：1797 K

文摘

A novel method is presented for solving the forced transient diffusion flame in the exit region of a coflow burner. Streamwise diffusion is eliminated, which produces the Burke–Schumann model. A mathematical transformation renders the transient, forced convection problem equivalent to a steady-state convection problem. The transformation differs from previous approaches because its use does not require a priori restriction to small perturbations. For this reason, flow fluctuations that are large fractions of the initial flow field may be described exactly and features of nonlinear response can be examined without recourse to detailed numerical simulation. The method is applied to study flame evolution and oscillation for two physically separated coflow slot burner flames as they merge.