Flame front surface characteristics in turbulent premixed propane/air combustion

Gülder, Ömer L.; Smallwood, Gregory J.; Wong, Rockney; Snelling, David R.; Smith, R. K.; Deschamps, B.; Sautet, Jean-Charles

doi:10.1016/s0010-2180(99)00099-1

Cited by 105 publications

(81 citation statements)

References 23 publications

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“…OH is not a good marker for flame front imaging and this is the cause of current controversial results: Laser-induced fluorescence of OH is one of the most commonly used flame front markers. Although a recent experimental effort implied that OH is not as good as the product of OH and CH 2 O as an indicator of heat release rate (Paul and Najm, 1998), it is adequate to mark the flame front location (Gü lder et al, 2000). 2.…”

Section: ö L Gü Lder and G J Smallwoodmentioning

confidence: 99%

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: ö L Gü Lder and G J Smallwoodmentioning

confidence: 99%

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

Gülder

Smallwood

2007

Combustion Science and Technology

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“…Majority of the studies related to turbulent premixed flames have been used the appropriate values for fractal dimension as an input parameter, based on the turbulence levels and flame wrinkling. These values are ranging [Gülder et al 2000] from 2.2 to 2.5 as found in literature. However, present study is carried out using an empirical model parameterised by North and Santavicca [1990] to calculate fractal dimension of the turbulent propagating flame following fractal theory, by employing dynamic formalism.…”

Section: Modelling Of the Fractal Dimensionmentioning

confidence: 89%

A Dynamic SGS Model for Les of Turbulent Premixed Flames

Gubba

Ibrahim

Malalasekera

2008

International Symposium on Advances in Computational Heat Transfer

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Numerical simulations are carried out for transient turbulent premixed flames using large eddy simulations (LES) technique. The sub-grid scale (SGS) mean chemical reaction rate is calculated using a simple algebraic relation for flame surface density (FSD), with a dynamic formulation for the model coefficient. The dynamic model is derived based on fractal theory and a flame wrinkling factor and implemented in compressible LES code. The developed model is used to simulate turbulent premixed flames of stoichiometric propane/air mixture in a vented combustion chamber, propagating over built-in solid obstacles. The fractal dimension is dynamically calculated by viewing the flame front as a fractal surface, using the SGS velocity fluctuations and the strained laminar burning velocity. The model predictions are validated against experimental measurements where good agreements are obtained.

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“…Since these thin layers behave like laminar flames, the turbulent burning velocity can be evaluated as the product of the surface area of the flamelets and the laminar burning speed, which is corrected to take stretch and flame curvature effects into account. The characterization and evaluation of the flamelet surface area, in relation to the turbulence properties, have been the subjects of many studies (Gülder and Smallwood, 1995;Gülder et al, 2000;North & Santavicca, 1990). According to the fractal theory, the general expression of the correlation that links the turbulent flame surface area and speed to the laminar ones is: surface.…”

Section: Turbulent Flame-speed Modelmentioning

confidence: 99%

“…However, although this choice could be acceptable for stationary flames issuing from burners (Gülder et al, 2000), in SI engine combustion, in which the mean flame front is assumed to be spherical, the wrinkling effect of turbulence on the flame front should be a function of the ratio between the characteristic flame-front and eddy dimensions, because the initially regular flame front surface progressively becomes more and more wrinkled as its dimension increases with respect to turbulent eddies. Therefore, (Baratta et al, 2006(Baratta et al, , 2008 replaced the integral length scale in Eq.…”

Section: Turbulent Flame-speed Modelmentioning

confidence: 99%

“…(20) with a characteristic linear dimension of the flame front, i.e., the square root of its surface area. Furthermore, (Gülder et al, 2000) pointed out that, if the fractal geometry approach yields a true measure of the wrinkled surface area of the flame front, then Eq. (20) may not be a reasonable assumption for the turbulent premixed flames in the flamelet regime.…”

Section: Turbulent Flame-speed Modelmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation Techniques for the Prediction of Fluid-Dynamics, Combustion and Performance in IC Engines Fuelled by CNG

Baratta¹,

Spessa²

2011

Computational Simulations and Applications

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Flame front surface characteristics in turbulent premixed propane/air combustion

Cited by 105 publications

References 23 publications

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

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

A Dynamic SGS Model for Les of Turbulent Premixed Flames

Numerical Simulation Techniques for the Prediction of Fluid-Dynamics, Combustion and Performance in IC Engines Fuelled by CNG

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