Flame front analysis of high-pressure turbulent lean premixed methane–air flames

Lachaux, Thierry; Halter, Fabien; Chauveau, Christian; Gökalp, İskender; Shepherd, I.G.

doi:10.1016/j.proci.2004.08.191

Cited by 58 publications

(51 citation statements)

References 13 publications

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“…Flame contour images are usually obtained by binarising laser induced fluorescence images [66][67][68], Mie scattering images [69], Rayleigh scattering images [70] or CPIV images [35,37,71]. During the process of binarisation, continuous flame contours get pixelated and this causes originally smooth contours to become less smooth [72].…”

Section: Flame Surface Density and Brush Thicknessmentioning

confidence: 99%

The structure of turbulent flames in fractal- and regular-grid-generated turbulence

Sponfeldner

Soulopoulos

Beyrau

et al. 2015

Combustion and Flame

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Section: Flame Surface Density and Brush Thicknessmentioning

confidence: 99%

The structure of turbulent flames in fractal- and regular-grid-generated turbulence

Sponfeldner

Soulopoulos

Beyrau

et al. 2015

Combustion and Flame

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“…Energy transfer to fresh reactants has a higher fraction of radiant energy transmission (compared to a non-luminous flame) and so has a larger thermal input from the solid to the flow. The enhanced reactant temperature these mechanisms produce greatly offsets the reduced flame speed that occurs with pressure and equivalence ratio [2], leading to a wider stable bulk velocity range and burning range over which a PMB may operabt compared to a free, flame. In addition to a wide operating range at lean equivalence atios, which has benefits in emissions performance, the thermal re-distribution of energy accomplished in the ceramic matrix evens out the exit gas temperature profile.…”

Section: Steady Combustion Characteristics High Pressure Results Withmentioning

confidence: 99%

“…Early studies on burners having two close-coupled sections of reticulated foam of different pore sizes with the combustion established at the interface and continuing in the downstream, coarse pore section have shown wide operating range, multi-fuel capability and low pollutant emissions at atmospheric conditions, [1][2][3][4]. The reason for using two pore sizes is to inhibit flame propagation upstream and make the process safer and more flexible.…”

Section: Introductionmentioning

confidence: 99%

Porous Media Combustors for Clean Gas Turbine Engines

Noordally¹,

Przybylski²,

Witton³

2004

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“…Measurements of flame brush thickness and flame surface densities characteristics followed the methodology of Lachaux et al [27]. The latter were obtained as a function of , derived from their contours, as described in [27], by Shepherd and Cheng [7].…”

Section: High Pressure Burner Experimentsmentioning

confidence: 99%

“…The latter were obtained as a function of , derived from their contours, as described in [27], by Shepherd and Cheng [7]. A progress variable The flame front area was found using the "statistical" method, whereby the flame front area was calculated using each individual binary flame image first.…”

Section: High Pressure Burner Experimentsmentioning

confidence: 99%

Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa

Bagdanavičius

Bowen

Bradley

et al. 2015

Combustion and Flame

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Key wordsTurbulent premixed flame, burning velocity, flame stretch rate, flame surface density, Markstein number. AbstractIndependent research at two centres using a burner and an explosion bomb has revealed important aspects of turbulent premixed flame structure. Measurements at pressures and temperatures up to 1.25 MPa and 673 K in the two rigs were aimed at quantifying the influences of flame stretch rate and strain rate Markstein number, Ma sr , on both turbulent burning velocity and flame surface density. That on burning velocity is expressed through the stretch rate factor, I o , or probability of burning, P b 0.5 . These depend on Ma sr , but they grow in importance as the Karlovitz stretch factor, K, increases, and are evaluated from the associated burning velocity data. Planar laser tomography was employed to identify contours of reaction progress variable in both rigs. These enabled both an appropriate flame front for the measurement of the turbulent burning velocity to be identified, and flame surface densities, with the associated factors, to be evaluated. In the explosion measurements, these parameters were derived also from the flame surface area, the derived P b 0.5 factor and the measured turbulent burning velocities. In the burner measurement they were calculated directly from the flame surface density, which was derived from the flame contours.A new overall correlation is derived for the P b 0.5 factor, in terms of Ma sr at different K and this is discussed in the light of previous theoretical studies. The wrinkled flame surface area normalised by the area associated with the turbulent burning velocity measurement, and the ratio of turbulent to laminar burning velocity, u t /u l , are also evaluated. The higher the value of , the more effective is an increased flame wrinkling in increasing u t /u l . A correlation of the product of k and the laminar flame thickness with Karlovitz stretch factor and Markstein number is explored using the present data and those of other workers. Some generality is revealed, enabling the wave length associated with the spatial change in mean reaction progress variable to be expressed by the number of laminar flame thicknesses, and the flame volume to be found.

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Flame front analysis of high-pressure turbulent lean premixed methane–air flames

Cited by 58 publications

References 13 publications

The structure of turbulent flames in fractal- and regular-grid-generated turbulence

The structure of turbulent flames in fractal- and regular-grid-generated turbulence

Porous Media Combustors for Clean Gas Turbine Engines

Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa

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