Multicomponent Fuel Diffusion Flames: Flame Structure for Coupled Diffusion-Flame and Premixed-Flame Burning Regimes

Fernando Fachini
2005 43rd AIAA Aerospace Sciences Meeting and Exhibit   unpublished
This analysis addresses some aspects of the extinction and the structure of diffusion flames established by burning of two fuels. This analysis is asymptotically performed presuming one-global-step chemical reactions with large activation energies. By working with fuels with different activation energies, the structure is composed by two zones with different thickness. The reactions of the fuels with oxygen occur practically inside a determined zone. The reaction with the highest activation
more » ... hest activation energy takes place in a thin zone and that one with the smallest activation energy takes place in a thick zone. The results pointed out that the structure of the thick zone is of the diffusion flame. However, the structure of the thin zone is of the lean-premixed-flame. Also, it was found that the thin zone is inside the thick zone and its position depends on the value of the Damköhler number of the reaction that occurs in the thin zone. Under the conditions followed by this analysis the reactions zones form a single flame. * 43rd AIAA Aerospace Sciences Meeting and Exhibit, 10-13 January, Reno, Paper AIAA 2005-0550 † Cachoeira Paulista,
doi:10.2514/6.2005-550 fatcat:vojakgd5djbwhmjdmyguu6ovia