Abstract
=SL (ratio of fluctuating velocity to laminar flame velocity) was from 0.9 to 15, and the Reynolds number, based on the integral length scale, was from 40 to 467. The flame front surface areas were calculated for each set of results and compared with experimental turbulent burning velocities. The three fractal algorithms used for analysis in this work gave significantly different results for the same flame image sets. Further, nondimensional turbulent burning rates computed from the fractal parameters did not agree with the experimental turbulent burning data, except for those fractal results obtained by the box-counting method and only for u 0 =SL � 6. Implications of these results for flamelet models are discussed. In addition, the perimeter-ratio approach recently adopted to estimate the wrinkled flame surface area is discussed, and it is argued that the results obtained by the perimeter-ratio approach might not be unique.
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