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The analysis addresses some aspects of the extinction and the structure of diusion 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 dierent activation energies, the structure is composed by two zones with dierent thickness. The reaction of each fuel with oxygen occurs practically inside a determined zone. The reaction with the highest 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 diusion 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 + , +···

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