プロパン・空気乱流予混合火炎の火炎面の三次元挙動 : 第3報,希薄,過濃混合気における火炎面の挙動(熱工学,内燃機関,動力など)

概要

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3-D movement of flame fronts in propane-air turbulent premixed Bunsen flames have been examined by a four-element electrostatic probe. The probability distributions of the magnitude and of the direction consines of the velocity vector of the flame front have been examined at three different positions in a turbulent flame brush, one position at position A and two positions off axis. This paper reports results obtained from flames of 0.80 and 1.40 equivalence ratios. At position A, velocity vectors of the flame front are distributed symmetrically around the burner axis independent of whether the flame front passes from the unburnt-to-burnt or burnt-to-unburnt direction. Off axis, velocity vectors of the flame front are mainly distributed towards the burner axis for the unburnt-to-burnt passage, while they are mainly distributed toward the outer side of the burner for the burnt-to-unburnt passage. Distribution of the magnitude of the velocity vector of the flame front for the former is slightly asymmetrical, with a tail to high velocity and that for the latter is asymmetrical, with a tail extending to low velocity and a sharper cut-off at high velocity. Effects of the direction of the flamelet propagation with respect to the gas and of fluctuation of the gas expansion tend to add to the flame-front for the former, but subtract from it for the latter.
社団法人日本機械学会の論文
2008-04-25