An experimental evaluation of an entrainment flame-propagation model

Groff, Edward G.

doi:10.1016/0010-2180(87)90148-9

Cited by 42 publications

(20 citation statements)

References 5 publications

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“…Flame kernels were 84 A.N. LIPATNIKOV and I. CHOMIAK ignited by a spark in homogeneous, isotropic, stationary (Karpov and Severin, \980;Groff, 1987;Kido et aI., 1994;Bradley et al, I994b, 1995) or decaying (Hainsworth, 1985;Mouqallid et aI., 1994;Ting et aI., 1994) turbulence. The flame radius was evaluated either using Schlieren pictures (Hainsworth, 1985;Groff, 1987;Mouqallid et aI., 1994;Ting et aI., 1994;Bradley et aI., I994b, 1995) or processing pressure records (Karpov and Severin, 1980;Kido et al, 1994).…”

Section: Validationmentioning

confidence: 99%

“…First, when the mean flame radius Ff is comparable with the integral turbulence length scale L and the pressure rise is negligible, the flame speed-S, = IFFf l,lt markedly increases during the expansion (Palm-Leis and Strehlow, 1969;Abdel-Gayed et aI., 1984;Groff, 1987;Checkel and Thomas, 1994;Ting et aI., 1994;Bradley et al I994b, 1995;Bielert, 1996). Physical mechanisms governing thc increase of 5, under a slight pressure rise and Ff 2: L have not been clarified yet and different viewpoints can be found in the literature.…”

Section: Introductionmentioning

confidence: 94%

“…L1PATNIKOV and J. CHOMIAK Experiments with kernels expanding in a premixed gas are widely used to study combustion in stationary turbulence generated in fan-stirred bombs (Karpov and Sokolik, 1961;Karpov and Severin, 1980;Abdel-Gayed and Bradley, 1977;Abdel-Gayed et aI., 1984, 1987Bradley et al 1994bBradley et al , 1995Groff, 1987;Kido et aI., 1989Kido et aI., , 1994Leisenheimer and Leuckel, 1996;Kwon et aI., 1992;Koroll et aI., 1993) or in grid-generated decaying turbulence in closed vessels (Checkel and Thomas, 1994;Ting et aI., 1994;Mouqallid et aI., 1994;Bielen, 1996), tubes (Hainsworth, 1985;OngUt et aI., 1993;Renou et aI., 1998), and open flows (Palm-Leis and Strehlow, 1969;Ho and Santavicca, 1987). To correctly interpret the data amassed in these measurements, physical effects related to flame propagation must be separated from effects due [0 spherical flame geometry.…”

Section: Introductionmentioning

confidence: 98%

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Transient and Geometrical Effects in Expanding Turbulent Flames

Lipatnikov

Chomiak

2000

Combustion Science and Technology

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Section: Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 98%

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Transient and Geometrical Effects in Expanding Turbulent Flames

Lipatnikov

Chomiak

2000

Combustion Science and Technology

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“…The mass burning velocity defined using this radius is equal to the velocity of turbulent entrainment of unburnt gas into the flame brush. The flame propagation model using this entrainment concept has been developed in several past studies (Blizard and Keck, 1974;Bradley et al, 1994;Groff, 1987;Tabaczynski et al, 1980). Alternatively, flame area enhancement due to turbulence has also been considered using a vortex tube model (Ashurst et al, 1994) and an exponential growth of flame surface area (Ashurst, 1995) to study expanding spherical flames.…”

Section: Introductionmentioning

confidence: 98%

Simulation of Spherically Expanding Turbulent Premixed Flames

Ahmed

Swaminathan

2013

Combustion Science and Technology

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Statistically spherical expanding turbulent premixed flames are computed using an unsteady Reynolds-averaged Navier-Stokes (URANS) approach. Mean reaction rate is closed using strained and unstrained flamelet models and an algebraic model. The flamelets are parametrized using the scalar dissipation rate in the strained flamelet model. It is shown that this model is able to capture the measured growth rate of methane-air turbulent flame ball, which is free of thermo-diffusive instability. The spherical flames are observed to accelerate continuously. The flame brush thickness grows in time and the role of turbulent diffusion on this growth seems secondary compared to the convection due to the fluid velocity induced by the chemical reaction. The spherical flames have larger turbulent flame speed, the leading-edge displacement speed s t , compared to the planar flames for a given turbulence and thermochemical condition. The computational results suggest s t =s 0 L $ Re n t with 0.57 n 0.58, where Re t is the turbulence Reynolds number and s 0 L is the unstrained planar laminar flame speed, for both spherical and planar flames.

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“…The restriction has been set not only for simplicity in reasoning but also due to the existence of extensive experimental databases for such flames, developed by Karpov and Severin (1980), Abdel-Gayed et al (1984), Hainsworth (1985), Groff (1987), Bradley et al (1994), Mouqallid et al (1994), Ting et al (1994), and Renou et al (2002).…”

mentioning

confidence: 99%

Application of the Markstein Number Concept to Curved Turbulent Flames

Lipatnikov¹,

Chomiak²

2004

Combustion Science and Technology

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Effects of large-scale stretching of premixed turbulent flames on flame speed are discussed and an extension of the classical Markstein number concept is proposed to parameterize flame speed modifications by the stretch rate. The concept is applied to fit various experimental data on the growth of the radius of expanding, statistically spherical, premixed, turbulent flames, obtained by different groups under different conditions. In all the cases studied, the suggested extension approximates the experimental data very well. It is shown also that this phenomenological approach may be utilized to determine the values of unperturbed turbulent flame speeds, S 0 t , by processing the experimental data for spherical flames. The difference between the obtained values of unperturbed S 0 t and the mean speeds of spherical flames, observed during expansion, may be as large as 200-300%. The strong influence of the perturbations discussed shows that such effects should be properly addressed when analyzing experimental data or invoking a presumed turbulent flame speed in simulations, for example, in large-eddy simulation based on the G-equation approach.

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An experimental evaluation of an entrainment flame-propagation model

Cited by 42 publications

References 5 publications

Transient and Geometrical Effects in Expanding Turbulent Flames

Transient and Geometrical Effects in Expanding Turbulent Flames

Simulation of Spherically Expanding Turbulent Premixed Flames

Application of the Markstein Number Concept to Curved Turbulent Flames

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