円筒形燃焼炉内の噴流拡散火炎の燃焼特性に関する研究 : 第2報,EINO_xの寸法則(熱工学,内燃機関,動力など)

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The flame characteristics of confined flames are investigated for propane and hydrogen jet nonpremixed flames in cylindrical furnaces. Flame characteristics can be strongly dominated by the combination of the burner and furnace geometries. In the present study, the effects of the inner diameter of the cylindrical furnance D_1, the turbulence at the flame boundary, and the global equivalence ratio φ are examined in terms of the emission of NO_x. The emission index of NO_x, EINO_x, decreases roughly with these parameters. The decrease in EINO_x is thought to be related to the dilution of mixtures by the burned gas and the flame stretch. The dilution is attributable to vortices formed at the furnace bottom, and the flame stretch is attributable to the air velocity difference ⊿U_a created by two air nozzles. The EINO_x characteristics are evaluated by the furnace Reynolds number Re,c based on the inner diameter of the furnace reflecting the dilution and the strain rate S〜Da^<-1> based on the air velocity difference, where Da indicates the Damkohler number. The EINO_x is well characterized by the factor D_1U_F⊿U_a, which is proportional to Re,_cDa^<-1>. This result indicates that the confined nonpremixed flame is characterized by the furnace volume, not the flame volume, which is related to the reaction rate of the jet nonpremixed flame with coflowing air based on the flamelet model. This may imply that the furnace combustion should be modified from the flamelet concept owing to the dilution.
一般社団法人日本機械学会の論文
2006-08-25

円筒形燃焼炉内の噴流拡散火炎の燃焼特性に関する研究 : 第2報,EINO_xの寸法則(熱工学,内燃機関,動力など)

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