周期的濃度変動を伴う混合気流中を伝播する火炎の特性 : 火炎特性に及ぼす濃度変動域の影響(熱工学,内燃機関,動力など)

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Experimental study was made to investigate the flame propagating through a methane/air mixture flow with periodic concentration fluctuation by using a stagnation flow type burner. Three kinds of fluctuations different in the range of fluctuation expressed as (φ_m, a)=(0.85, 0.06), (1.07, 0.17) and (1.30, 0.06), where φ_m is the mean equivalence ratio and a is the fluctuation amplitude, were examined for the frequency &inof; ranging from 3 Hz to 50 Hz, and fluctuating burning velocity and burnt gas temperature were estimated or measured. The dependences of their fluctuation widths on &inof; were compared among the three kinds of fluctuations and discussed on the basis of the apparent equivalence ratio φ_a evaluated for the mixture flowing into the flame front using the relationship between mixture equivalence ratio and burnt gas temperature for the stationary flame. The results obtained were: (1) For a certain range of &inof;, the maximum and minimum burning velocities of the flame are, respectively, higher and lower than those estimated for the mixture equivalence ratio fluctuation at the burner exit, irrespective of the kind of fluctuation. (2) The fluctuation width of φ_a, 2A, becomes maximum at the some value of &inof; for every kind of fluctuation. This value of &inof; for the fluctuation (1.07, 0.17) which includes the stoichiometric condition is approximately half of the values for other fluctuations. (3) The width 2A for the lean side fluctuation (0.85, 0.06) is larger than that for the rich side fluctuation (1.30, 0.06) in spite of the same value of a.
一般社団法人日本機械学会の論文
2005-04-25

周期的濃度変動を伴う混合気流中を伝播する火炎の特性 : 火炎特性に及ぼす濃度変動域の影響(熱工学,内燃機関,動力など)

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