水素予混合火炎の消炎限界に及ぼす要因(熱工学,内燃機関,動力など)

概要

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Reduction of CO_2 is urgently required and we are attracted by H_2 fuel alternative to hydrocarbon energy sources. In the present study, we introduced CO_2 emission index to estimate the greenhouse effect of the hydrocarbon fuels. The combustion characteristics of H_2-Air-N_2 were investigated using a counterflow burner. Also, effects of turbulence were examined. Results show that the critical stretch rate appears on the leaner side than the equivalence ratio of the maximum burning velocity. Critical stretch rates decrease with the oxygen concentration. For Le<1, the double flame stands closely and extinguishes by incomplete combustion. Contrarily, for Le>1, the distance between the double flame increases and extinction occurs by the flame stretch. The Karlovitz number Ka at extinction of the H_2 flames is the same as that of hydrocarbons. Additional stretch induced by turbulence is represented by the inverse of the Kolmogorov time scale. Sum of the stretch rates by mean flow and turbulence is found to coincide with the critical stretch rate of the laminar flame.
社団法人日本機械学会の論文
2004-08-25