Flame front surface characteristics in turbulent premixed propane/air combustion

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DOIResolve DOI: http://doi.org/10.1016/S0010-2180(99)00099-1
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Journal titleCombustion and Flame
Pages407416; # of pages: 10
SubjectFlame front surfaces; Premixed propaire air combustion; Combustion; Flame
AbstractThe characteristics of the flame front surfaces in turbulent premixed propane/air flames were investigated. Flame front images were obtained using laser-induced fluorescence (LIF) of OH and Mie scattering on two Bunsen-type burners of 11.2-mm and 22.4-mm diameters. Nondimensional turbulence intensity, u'/S(L), was varied from 0.9 to 15, and the Reynolds number, based on the integral length scale, varied from 40 to 467. Approximately 100 images were recorded for each experimental condition. Fractal parameters (fractal dimension, inner and outer cutoffs) and corresponding standard deviations were determined by analysis of the flame front images using the caliper technique. The fractal dimensions derived from OH and Mie scattering images are almost identical. However, inner and outer cutoffs from OH images are consistently higher than those obtained from Mie scattering. The self-similar region of the flame front wrinkling is about a decade for all flames studied. In the nondimensional turbulence intensity range from 1 to 15, it was found that the mean fractal dimension is about 2.2 and it does not show any dependence on turbulence intensity. This contradicts the findings of the previous studies that showed that the fractal dimension asymptotically reaches to 2.35-2.37 when the nondimensional turbulence intensity u'/S(L) exceeds 3. It is shown that the reason for this discrepancy is the image analysis method used in the previous studies. Examples are given to show the inadequacy of the circle method used in previous studies for extraction of fractal parameters from flame front images. The fractal parameters obtained so far, in this and previous studies, are not capable of correctly predicting the turbulent burning velocity using the available fractal area closure model.
Publication date
AffiliationNRC Institute for Chemical Process and Environmental Technology; NRC Industrial Research Assistance Program; NRC Institute for Research in Construction; National Research Council Canada (NRC-CNRC)
Peer reviewedNo
NRC number51492
NPARC number5126091
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Record identifier1ea53673-12d5-4fd4-b706-704817f70adf
Record created2009-10-02
Record modified2016-05-09
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