Abstract
The fractal-like character of the laminar flamelet surface in turbulent premixed combustion of lean methane/air mixtures was studied by using the laser tomography technique to visualize the instantaneous flame surface in the two-dimensional section cut by the laser sheet. The fractal analysis of the surface revealed that the surface actually exhibits a self-similarity behavior in a narrow range of scale, and the value of fractal dimension can be defined. The inner cutoff scale was the laminar flame thickness, while the outer cutoff scale was the flame size. The fractal dimension was found to depend on the orientation of the section, and to increase towards downstream. It is suggested that the observed fractal-like character is not directly connected to approach flow turbulence, but should represent certain aspects of the flamelet itself.
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Takeno, T., Murayama, M. & Tanida, Y. Fractal analysis of turbulent premixed flame surface. Experiments in Fluids 10, 61–70 (1990). https://doi.org/10.1007/BF00215012
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DOI: https://doi.org/10.1007/BF00215012