Journal ArticleDOI
Numerical simulations of premixed flame cellular instability for a simple chain-branching model
Gary J. Sharpe,S.A.E.G. Falle +1 more
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TLDR
In this article, the role of intermediates in the flame structure on the cellular instability was examined in the context of a two-step chain-branching chemistry model, which consists of a thermally neutral, but temperature sensitive, chain branching step which produces intermediates such as radicals and an exothermic, zero activation energy chain-completion step which converts the intermediates into products.About:
This article is published in Combustion and Flame.The article was published on 2011-05-01. It has received 16 citations till now. The article focuses on the topics: Premixed flame & Flame speed.read more
Citations
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Hydrodynamic and thermodiffusive instability effects on the evolution of laminar planar lean premixed hydrogen flames
C. Altantzis,Christos E. Frouzakis,Ananias G. Tomboulides,Moshe Matalon,Konstantinos Boulouchos +4 more
TL;DR: In this article, numerical simulations with single-step chemistry and detailed transport are used to study premixed hydrogen/air flames in two-dimensional channel-like domains with periodic boundary conditions along the horizontal boundaries as a function of the domain height.
Journal ArticleDOI
Onset of cellular flame instability in adiabatic CH4/O-2/CO2 and CH4/air laminar premixed flames stabilized on a flat-flame burner
TL;DR: In this article, the authors present numerical and experimental studies on the onset and evolution of laminar cellular flames of CH4/O-2/CO2 (oxy-fuel), stabilized in the proximity of a flat-flame burner at atmospheric pressure.
Journal ArticleDOI
Flame propagation in a tube with wall quenching of radicals
TL;DR: In this article, a two-step chemistry model for gaseous combustion is employed and it consists of a chain-branching reaction and a completion reaction, and a one-step surface quenching reaction of radicals is considered.
Journal ArticleDOI
Effects of heat conduction and radical quenching on premixed stagnation flame stabilised by a wall
Huangwei Zhang,Zheng Chen +1 more
TL;DR: In this article, a premixed stagnation flame stabilised by a wall is analyzed theoretically considering thermally sensitive intermediate kinetics, and the effects of heat conduction and radical quenching on the wall surface are examined.
Journal ArticleDOI
Nonlinear evolution of 2D cellular lean hydrogen/air premixed flames with varying initial perturbations in the elevated pressure environment
TL;DR: In this article, the cellular instability of lean hydrogen/air laminar premixed flames with an equivalence ratio of 0.6 at a 5m and a 25m pressure was studied, and a detailed chemical kinetics mechanism and detailed transport properties were carried out to simulate the initial linear growth of instability as well as the nonlinear evolution of flames.
References
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Journal ArticleDOI
Diffusional-Thermal Theory of Cellular Flames
TL;DR: In this article, the formation of cellular structure in a flame is conditioned by diffusion and heat conduction effects and is independent of the hydrodynamics of the perturbed flame, and it is proved that cellular flames are formed only when a sufficiently light reactant of the combustible mixture is present in a low concentration.
Journal ArticleDOI
Linear Stability Analysis of Nonadiabatic Flames: Diffusional-Thermal Model
Guy Joulin,P Clavin +1 more
TL;DR: In this paper, the authors applied matched asymptotic expansions to investigate the effects of heat losses on linear stability of a planar flame, which is governed by a one-step irreversible Arrhenius reaction.
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The development and structure of flame instabilities and cellularity at low Markstein numbers in explosions
TL;DR: In this paper, the authors studied the formation of cellular structures during spherical gaseous explosions using natural light and high-speed cine photography, as well as single-shot planar laser-induced fluorescence from the OH radical.
Journal ArticleDOI
Laminar burning velocities of lean hydrogen-air mixtures at pressures up to 1.0 MPa
TL;DR: In this article, the authors measured the laminar burning velocity, u{sub l}, and the associated strain rate Markstein number, Ma{sub sr}, of H{sub 2}-air mixtures of a spherical explosion bomb with central ignition.
Journal ArticleDOI
Studies of cellular flames in hydrogenoxygennitrogen mixtures
T. Mitani,Forman A. Williams +1 more
TL;DR: For downwardly propagating flames in pyrex tubes at atmospheric pressure and intial temperature of 295°K, measurements were made of the nitrogen dilution required for quenching as a function of the hydrogen-oxygen ratio, as well as of flame temperatures, flame speeds, temperature gradients behind the flame, unburnt hydrogen, and cell sizes as mentioned in this paper.
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