伸張を有する層流予混合メタン火炎に及ぼす水素添加の影響 : 第2報,火炎構造と燃焼機構への影響(熱工学,内燃機関,動力など)

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There has been much recent attempt at the operation of engines on gaseous fuels, which has been motivated largely by the need to produce engines that can comply with the ever more demanding regulations for cleaner exhaust emissions. In this context, natural gas in a potential alternative to gasoline due to lower overall pollutant emissions and more excellent fuel economy. On the other hands, the lean burn approach has such a number of attractive features as high thermal efficiency, low likelihood for knock, reduced emissions especially of NO_x. However there are number of difficulties to be tackled associated with lean burn operation, such as slower flame propagation, less complete combustion, increased cyclic variations and locally flame quenching. To overcome these problems, in past studies, hydrogen addition to mixtures has been proposed as one approach and combustion characteristics of hybrid fuels have been investigated such as for laminar flames. In our previous studies, hydrogen addition was found to be effective in improving lean burning not only for laminar flames but also for turbulent flames on fuel-lean sides. Although qualitative explanation was made to some extent, combustion mechanisms and flame structure have not been clarified yet. In our 1st report, the effects of hydrogen addition on stretched laminar methane flames were studied in terms of the effect on laminar burning velocity, and it was found that the effects of hydrogen addition depend on equivalence ratio. In this study, following 1st report, the effect of hydrogen addition on stretched laminar methane flames was investigated in terms of the flame structures, relevant chemical species and element reactions, for the explanation of the dependence of the effects of hydrogen addition on equivalence ratio.
社団法人日本機械学会の論文
2003-01-25

伸張を有する層流予混合メタン火炎に及ぼす水素添加の影響 : 第2報,火炎構造と燃焼機構への影響(熱工学,内燃機関,動力など)

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