The stabilization mechanism of lifted diffusion flames

Vanquickenborne, L.; Tiggelen, A. van

doi:10.1016/0010-2180(66)90028-9

Cited by 354 publications

(120 citation statements)

References 4 publications

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“…The oldest considers the base of the flame as a premixture of fuel and oxidizer. The burning velocity of this mixture equals the flow velocity at the flame base [4]. Peters and Williams [5], however, have argued that no sufficient premixing of the reactants can take place for this concept to be valid, in accordance with experimental results of Pitts [6].…”

Section: Introductionmentioning

confidence: 69%

“…This theory can be used to describe the threshold behavior of the liftoff of the flame by means of the probability of burning [10]. This concept leads to a liftoff condition involving both a percolation threshold P~ and a probability of burning Pb [5] J°b = Pc (4) at a radial position where the mean mixture fraction f is stoichiometric f = fst. If Eq.…”

Section: Modeling Of the Liftoff Heightmentioning

confidence: 99%

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Modeling and calculation of turbulent lifted diffusion flames

Sanders

Lamers

1994

Combustion and Flame

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Section: Introductionmentioning

confidence: 69%

Section: Modeling Of the Liftoff Heightmentioning

confidence: 99%

Modeling and calculation of turbulent lifted diffusion flames

Sanders

Lamers

1994

Combustion and Flame

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“…The location of the flame base is governed by the premixed nature of the fuel air mixture. Computational models using this criterion were able to predict lift-off heights for the jet fires considered [15]. Experimentalists were also able to correlate measured lift-off heights for a range of fuels using the premixed assumption and the turbulent burning velocity, [2].…”

mentioning

confidence: 99%

Modeling Lifted Methane Jet Fires Using the Boundary-Layer Equations

Cumber

Spearpoint

2006

Numerical Heat Transfer, Part B: Fundamentals

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The focus of this paper is turbulent lifted jet fires. The main objective is to present a lifted jet fire methodology using the boundary layer equations as a basis. The advantages of this are finite volume mesh independent predictions of the mean flow fields can be calculated on readily available computer resources which leads to rigorous model calibration. A number of lift-off models are evaluated. The model of choice is one based on the laminar flamelet quenching concept combined with a model for the large-scale strain rate.

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“…This is in contrast to the approach of Vanquickenborne and Van Tiggelen [40] and Kalghatgi [36], who balanced a turbulent burning velocity against the velocity of the oncoming gas. The latter also presented a dimensionless correlation for the lift-off distance that involves S L , the maximum laminar burning velocity of the fuel-air mixture under atmospheric conditions.…”

Section: The U* Parametermentioning

confidence: 64%

Jet flame heights, lift-off distances, and mean flame surface density for extensive ranges of fuels and flow rates

Bradley

Gaskell

et al. 2016

Combustion and Flame

106

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An extensive review and re-thinking of jet flame heights and structure, extending into the choked/supersonic regime is presented, with discussion of the limitations of previous flame height correlations. Completely new dimensionless correlations for the plume heights, lift-off distances, and mean flame surface densities of atmospheric jet flames, in the absence of a cross wind, are presented. It was found that the same flow rate parameter could be used to correlate both plume heights and flame lift-off distances. These are related to the flame structure, jet flame instability, and flame extinction stretch rates, as revealed by complementary experiments and computational studies. The correlations are based on a vast experimental data base, covering 880 flame heights. They encompass pool fires and flares, as well as choked and unchoked jet flames of CH 4 , C 2 H 2 , C 2 H 4 , C 3 H 8 , C 4 H 10 and H 2 , over a wide range of conditions. Supply pressures range from 0.06 to 90MPa, discharge diameters from 4·10 -4 to 1.32 m, and flame heights from 0.08 to 110 m. The computational studies enabled reaction zone volumes to be estimated, as a proportion of the plume volumes, measured from flame photographs, and temperature contours. This enabled mean flame surface densities to be estimated, together with mean volumetric heat releases rates. There is evidence of a "saturation" mean surface density and increases in turbulent burn rates being accomplished by near pro rata increases in the overall volume of reacting mixture.

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The stabilization mechanism of lifted diffusion flames

Cited by 354 publications

References 4 publications

Modeling and calculation of turbulent lifted diffusion flames

Modeling and calculation of turbulent lifted diffusion flames

Modeling Lifted Methane Jet Fires Using the Boundary-Layer Equations

Jet flame heights, lift-off distances, and mean flame surface density for extensive ranges of fuels and flow rates

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