Flame Propagation in Layered Methane-Air Systems

Liebman, I.; Corry, John; Perlee, H.E.

doi:10.1080/00102206908952204

Cited by 48 publications

(12 citation statements)

References 1 publication

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“…The conditions under which the boundary layer assumptions will break down are given in Section VI. Liebman et al (1970) have carried out experiments of flame propagation in an unsteady mixing layer that confirm qualitatively the results presented below. Wolanski and Wojcicki (1973) carried out experiments on the ignition of the unsteady mixing layer that is formed when a combustible gas flows into an oxidizing atmosphere.…”

supporting

confidence: 82%

“…For this one-dimensional analysis to be directly applicable, the ignition source must also have a one-dimensional structure; however, the ideas used here could also be used to analyze the flame propagation process th~oug~a one-dimensional mixing layer, when the Ignition source is point-like, as occurred in the experimental work of Liebman et al (1970).…”

Section: IIImentioning

confidence: 97%

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An Asymptotic Analysis of Unsteady Diffusion Flames for Large Activation Energies

̄Án

Crespo

1976

Combustion Science and Technology

182

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supporting

confidence: 82%

Section: IIImentioning

confidence: 97%

An Asymptotic Analysis of Unsteady Diffusion Flames for Large Activation Energies

̄Án

Crespo

1976

Combustion Science and Technology

182

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“…Investigations by Phillips (1965) ;Liebman, Corry and Perlee (1970); Hirano et al (1977); Feng, Lam and Glassman (1975); Hirano and Suzuki (1980) and others have therefore tended to focus on flame speed and gas movement. Consequently, in the latter two studies, models were developed which incorporated detailed hydrodynamics but neglected diffusional effects.…”

Section: Introductionmentioning

confidence: 98%

Flame Stabilization in a Layered Medium

Margolis

Kerstein

1983

Combustion Science and Technology

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We analyze the steady-state structure of a l1ame stabilized on a burner which is fed by a nonuniform mixture. Our diffusional-thermal model is based on the assumption of large overall activation energy, and the nonuniformity in the feed is treated as a perturbation of the uniform case. The flame shape for a given inflow enthalpy profile depends on Lewis number, inflow velocity, and conductance of the burner, and for sufficiently small Lewis number, we exhibit the onset of cellular flame formation. Unlike previously encountered flame instabilities, the transition to a cellular name occurs here in a gradual, rather than an abrupt, fashion through an "imperfect bifurcation."

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“…Two limiting cases that have been the most frequently analyzed are premixed flames, in which all reactants are completely mixed prior to combustion, and diffusion flames, in which the reactants are initially completely separated. Premixed flames have associated with them the concept of a propagation velocity; diffusion flames normally do not, although propagation can occur along the interface between air and fuel layers such as sometimes occurs along the roofs of mine shafts [1,2]. Between these two extremes, an entire spectrum exists in which the reactants are neither completely premixed nor fully separated prior to combustion.…”

Section: Introductionmentioning

confidence: 99%

Some properties of nearly premixed laminar flame propagation along weakly stratified layers in combustible gas mixtures

Talley

1990

Combustion and Flame

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Nearly premixed laminar flame propagation along weakly stratified layers in combustible gas mixtures is examined theoretically in the limit of weak flame stretch, high activation energy, and unity Lewis number. The stratification is represented by the variation in flame temperature along the reaction zone. Stratification is shown to affect the propagation velocity by a convective loss mechanism and by a diffusive mechanism that could be termed flame thickening. Whether a given amount of stratification should be expected to increase or decrease the propagation velocity compared with that of a nonstratified mixture depends on the angle the flame makes to the flow. The propagation velocity is most sensitive to the stratification for small flame angles.

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Flame Propagation in Layered Methane-Air Systems

Cited by 48 publications

References 1 publication

An Asymptotic Analysis of Unsteady Diffusion Flames for Large Activation Energies

An Asymptotic Analysis of Unsteady Diffusion Flames for Large Activation Energies

Flame Stabilization in a Layered Medium

Some properties of nearly premixed laminar flame propagation along weakly stratified layers in combustible gas mixtures

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