酸化剤予熱と理論混合分率の変化が対向流CH_4-O_2-Ar拡散火炎の消炎に与える影響(熱工学,内燃機関,動力など)

概要

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The effects of oxidizer preheating and dilution levels of fuel and exygen on the extinction and structure of counter flow CH_4-O_2-Ar diffusion flame were investigated experimentally and numerically. The oxidizer temperature of both experiments and calculations were varied up to 1100K. The oxidizer preheating significantly contributes to expansion of the extinction limits. The oxidizer preheating and the dilution levels are characterized by the magnitude of stoichiometric mixture fraction (F_<st>). The extinction limit curves can be roughly divided into two regions based on the magnitude of F_<st>. In the region about F_<st><0.5 which the flame location is in the oxidizer flow side, the oxidizer concentration exerts dominant effect on the extinction, and the effects of preheating is clearly observed. In this region, the combustion reaction appears with oxidizer preheating from the upper of oxidizer side. On the other hand, the region about F_<st>>0.5, which the flame is located to the fuel flow, the expansion of reaction zone with preheating is almost small. Only small effects of the oxidizer preheating to the extinction limits are observed in this region. As the results, the flame location is quite important factor to understand the effects of dilution levels and oxidizer preheating on the extinction phenomena.
一般社団法人日本機械学会の論文
2006-04-25