Quasi-isobaric ignition near the flammability limits. Flame balls and self-extinguishing flames

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• 作者：P. Clavin ^{paul.clavin@irphe.univ-mrs.fr}
• 关键词：Flammability limits ; Flame kernels ; Self-extinguishing flames
• 刊名：Combustion and Flame
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：175
• 期：Complete
• 页码：80-90
• 全文大小：664 K
• 卷排序：175

文摘

Asymptotic analyses are presented for spherical flame kernels (steady solutions) and slow flame expansion in mixtures near and beyond the flammability limits corresponding to a molecular diffusion coefficient of the limiting species greater than the thermal diffusivity, Lewis number smaller than unity, Le < 1. The results concern also the dynamical quenching observed in micro-gravity experiments (self-extinguishing flames) at large radius of flame expanding in non-flammable mixtures (beyond the flammability limits of planar flames).