A Study on the Fine Structure of Propagating Turbulent Flames in Premixed Mixtures : An Analysis of the Schlieren Images Based on a Flame Structure Model

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The structure of propagating turbulent flames in premixed propane/air (artificial) mixtures in a constant-volume bomb has been observed with schlieren photography, where the characteristics of the mixtures, including the laminar flame thickness, laminar burning velocity and oxygen concentration, as well as the turbulence intensity of the flow field, have been varied independently. The obtained schlieren images show that the complicated schlieren fringes increased rapidly as the turbulence intensified; this is attributed to the superimposition of the increased individual schlieren images of small flamelets existing within the flame zone thickness. The schlieren images were then analyzed using a model for the fine structure of propagating turbulent flames. In the model, a turbulent flame is considered as a mingling of a wrinkled laminar flame and a distributed-islands flame ; the characteristic reaction rate of the turbulent flame is determined by the Damkohler's number and the characteristic reaction time of each flame.
一般社団法人日本機械学会の論文
1990-05-15