An experimental estimation of flame surface density and mean reaction rate in turbulent premixed flames

Deschamps, B.; Boukhalfa, Abdelkrim; Chauveau, Christian; Gökalp, İskender; Shepherd, I.G.; Cheng, R.K.

doi:10.1016/s0082-0784(06)80060-3

Cited by 21 publications

(10 citation statements)

References 3 publications

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“…They are also typical of those found at low to moderate turbulence intensities (u 0 =S L ¼ 0.25 to 2.0) in Bunsen flames and spark ignition engines . The profiles determined in this study are comparable in shape to those found by Veynante et al (1994) in a two-dimensional V-flame, by Deschamps et al (1994) in a Bunsen flame, and by Boger et al (1998) obtained by direct numerical simulation. R max has little variation over the range of u 0 =S L (0.84 to 15.0) investigated here, as shown in Figure 3.…”

Section: Flame Surface Densities In Premixed Combustion 197supporting

confidence: 83%

“…Experimental data obtained in Bunsen flames and firing homogenous charge spark ignition engines at low turbulence intensities, i.e., u 0 =S L less than 2, did not show any significant variation of the flame surface density with turbulence intensity (Deschamps et al, 1994Smallwood and Deschamps, 1996;Knaus et al, 1999). To provide experimental flame surface density data at medium to high turbulence intensities, we have carried out an experimental program and determined the flame surface densities of turbulent premixed flames on a Bunsen type burner.…”

Section: Introductionmentioning

confidence: 75%

“…Most of the experimental data on flame surface density are limited to low turbulence intensities, e.g., Deschamps et al (1994), Deschamps et al (1996), Shepherd (1996), and Ghenaï (1996). In most of studies, the threedimensional information has been extracted from the two-dimensional data by making certain assumptions.…”

Section: Introductionmentioning

confidence: 99%

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Flame Surface Densities in Premixed Combustion at Medium to High Turbulence Intensities

Gülder

Smallwood

2007

Combustion Science and Technology

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The surface densities of flame fronts in turbulent premixed propane= air flames were determined experimentally. The instantaneous flame fronts were visualized using laser induced fluorescence (LIF) of OH on two Bunsen type burners of 11.2 and 22.4 mm diameters. Nondimensional turbulence intensity, u 0 =S L , was varied from 0.84 to 15, and the Reynolds number, based on the integral length scale, varied from 34 to 467. These flames are in the flamelet combustion regime as defined by the most recent turbulent premixed combustion diagrams. From 100 to 800 images were recorded for each experimental condition. Flame surface densities were obtained from the instantaneous maps of the progress variable, which is zero in the reactants and unity in the products. These flame surface densities were corrected for the mean direction cosines of the flame fronts, which had a typical value of 0.69 for the Bunsen flames. In the non-dimensional turbulence intensity range of up to 15, it was found that the maximum flame surface density and the integrated flame surface density across the flame brush do not show any significant dependence on turbulence intensity. This was discussed in the framework of a flame surface density-based turbulent premixed flame propagation closure model.

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Section: Flame Surface Densities In Premixed Combustion 197supporting

confidence: 83%

Section: Introductionmentioning

confidence: 75%

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Flame Surface Densities in Premixed Combustion at Medium to High Turbulence Intensities

Gülder

Smallwood

2007

Combustion Science and Technology

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“…It has been used extensively in the literature [9][10][11][12]. Flame surface density [13] and fractal analysis were performed from the extraction of the contour using this optical diagnostic [14][15][16][17]. Gülder et al [18] performed a comparative study on the characteristics of the flame front using OH PLIF and Mie scattering tomography.…”

Section: Methodsmentioning

confidence: 99%

“…For two-dimensional images, this relation is written as If the mean flow field is axisymmetric, ∇c is contained in the (r, z) plane: n (r,z) s Σ (r,z) = −∇c. (13) Both formulations of the gradient of the mean progress variable lead to…”

Section: From a 2d To A 3d Analysismentioning

confidence: 99%