Fundamental mechanisms in premixed turbulent flame propagation via vortex–flame interactions part II: numerical simulation

Mantel, T.; Samaniego, J. M.

doi:10.1016/s0010-2180(99)00019-x

Cited by 25 publications

(14 citation statements)

References 30 publications

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“…-Small influence of the curvature on the stretch [45] and on the PDF (for highly turbulent flows [57], as in this study). Thus, only effects of strain are taken into account in the integration of the PDF: a ≈ a s .…”

Section: Extension Of Turbulent Combustion Models With Strain and Heamentioning

confidence: 67%

“…The two flame configurations respond differently [42,45] to increase of strain rate. In symmetric counterflow, the reaction rate is almost unchanged until the flame fronts approach the stagnation point, such that the two reaction zones start to interact.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, an "extinction" event and the corresponding critical strain rate are difficult to identify. For practical applications, the asymmetric counterflow can be taken as a good approximation of turbulent premixed flames [45,47].…”

Section: Introductionmentioning

confidence: 99%

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Combined Influence of Strain and Heat Loss on Turbulent Premixed Flame Stabilization

Tay-Wo-Chong

Zellhuber

Komarek

et al. 2015

Flow Turbulence Combust

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The present paper argues that the prediction of turbulent premixed flames under non-adiabatic conditions can be improved by considering the combined effects of strain and heat loss on reaction rates. The effect of strain in the presence of heat loss on the consumption speed of laminar premixed flames was quantified by calculations of asymmetric counterflow configurations ("fresh-to-burnt") with detailed chemistry. Heat losses were introduced by setting the temperature of the incoming stream of products on the "burnt" side to values below those corresponding to adiabatic conditions. The consumption speed decreased in a roughly exponential manner with increasing strain rate, and this tendency became more pronounced in the presence of heat losses. An empirical relation in terms of Markstein number, Karlovitz Number and a non-dimensional heat loss parameter was proposed for the combined influence of strain and heat losses on the consumption speed. Combining this empirical relation with a presumed probability density function for strain in turbulent flows, an attenuation factor that accounts for the effect of strain and heat loss on the reaction rate in turbulent flows was deduced and implemented into a turbulent combustion model. URANS simulations of a premixed swirl burner were carried out and validated against flow field and OH chemiluminescence measurements. Introducing the effects of Wolfgang Polifke Flow Turbulence Combust strain and heat loss into the combustion model, the flame topology observed experimentally was correctly reproduced, with good agreement between experiment and simulation for flow field and flame length.

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Section: Extension Of Turbulent Combustion Models With Strain and Heamentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Combined Influence of Strain and Heat Loss on Turbulent Premixed Flame Stabilization

Tay-Wo-Chong

Zellhuber

Komarek

et al. 2015

Flow Turbulence Combust

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“…We consider the interaction of the above premixed methane-air flame with a counter-rotating 2D vortex pair. This is a typical flow that has been investigated both numerically [77,69,78,79,73,80] and experimentally [81][82][83][84][85][86], and serves as a useful test problem.…”

Section: D Flamementioning

confidence: 99%

A Semi-implicit Numerical Scheme for Reacting Flow

Knio¹,

Najm²,

Wyckoff³

1999

Journal of Computational Physics

158

145

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“…Toutefois, un tourbillon isolé n'est pas représentatif de toute la turbulence que rencontre une flamme et là encore les conclusions de cette étude ne sont pas définitives; -le nombre minimum de réactions chimiques à prendre en compte pour bien décrire la chimie des flammes étirées. Presque tous les modèles de combustion turbulente ne considère qu'une réaction globale du type Fuel + 0xx danl -Produits' Or, des études asymptotiques [12] et des simulations numé-riques directes [13] utilisant un schéma cinétique à 2 réac-tions montrent le rôle très important de l'espèce radicalaire considérée dans le schéma à 2 étapes sur les flammes laminaires éti rées ; -les phénomènes de diffusion turbulente à contre-gradient dans le cas des flammes turbulentes. Les corrélations u" y;-a, sont presque toujours modélisées via une hypothèse de premier gradient et un coefficient de diffusion turbulente.…”

Section: • Structure Des Flammes Turbu-lentes Dans Les Moteurs à Iunclassified

Problèmes liés à la modélisation de la combustion dans les moteurs à injection directe

Mantel

Galzin

1998

La Houille Blanche

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Fundamental mechanisms in premixed turbulent flame propagation via vortex–flame interactions part II: numerical simulation

Cited by 25 publications

References 30 publications

Combined Influence of Strain and Heat Loss on Turbulent Premixed Flame Stabilization

Combined Influence of Strain and Heat Loss on Turbulent Premixed Flame Stabilization

A Semi-implicit Numerical Scheme for Reacting Flow

Problèmes liés à la modélisation de la combustion dans les moteurs à injection directe

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