Diffusional Combustion of Gases

Zel’dovich, Ya. B.; Баренблатт, Г. И.; Librovich, V. B.; Makhviladze, G. M.

doi:10.1007/978-1-4613-2349-5_7

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…Therefore, to clarify the nature of these interactions, researchers have relied on simple, canonical configurations such as planar and spherical flames [1,2,3]. Although intrinsic flame instabilities of diverse nature are widely recognized in combustion science, some of these canonical stable regimes of premixed hydrogen-air flames have been reproduced in controlled, simplified experiments under microgravity conditions or within thin gaps [4,5].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the bistable propagation of lean premixed hydrogen flames

Domínguez-González,

Encinar,

Martínez-Ruiz

2024

J. Phys.: Conf. Ser.

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Premixed hydrogen-air flames that propagate in slender channels have been recently found to be bistable in the limit of fuel-lean mixtures and non-negligible heat losses. Specifically, two stable configurations conformed by either a circular or a double-cell flame front arise for the same combination of controlling parameters (fuel mixture, heat transfer). Nevertheless, this multiplicity of solutions lacks a satisfactory explanation that predicts the formation of either one or another structure given a particular ignition transient. In this work, the analysis of a set of numerical simulations is offered to unveil the underlying physics controlling the bistable behavior. The formulation employed here proves that simplified one-step Arrhenius reaction and quasi-two-dimensional equations suffice to reproduce the complex dynamics, rendering three-dimensional effects and detailed chemical kinetics as second-order contributions that may be important, however, to provide exact quantitative results. Specifically, the initial temperature profiles and subsequent expansion of the flow field prescribe the growth of the flame front leading to different curvatures and sizes of the kernel that control the evolution into one of the canonical structures. Moreover, the achievement of double-cell flames require splitting and reorientation processes prior to pairing of isolated flames, which call for specific initialization conditions that enable these transient dynamics.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of the bistable propagation of lean premixed hydrogen flames

Domínguez-González,

Encinar,

Martínez-Ruiz

2024

J. Phys.: Conf. Ser.

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Unsteady Planar Diffusion Flames: Ignition, Travel, Burnout

Fendell

Wu²

1995

Combustion Science and Technology

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Cylindrical diffusion laminar flames

Bastos-Netto¹

1995

31st Joint Propulsion Conference and Exhibit

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Axisymmetric tubulaÍ laminar flames are inveitisated in a near equilibrium diffusion .""n"í"0 regime with a thin reaction zone separating tfr" n.f unã oxidizer radial streams The solution ;i thit "normal Burke-schumann like problem" vields the flame position and the concentratlon 'oroÀi"t rot ttt" fuel and oxidizer and' as expected' ii. oroo.t stretching variable for future iiu.rtlgàtion of the flarne strucrure for large u.,iuu,í-energies The temperature profile is also ãúi"i""o f"t ihe classical conditions of Lewis Nurnbers equal to unitY. bsaduÉian The imponance of flame-flow interaclion in Combusiion Research is undeniable 'Jy'hile Premixed flames have been intensively studied. in a wide spectrum of geometries and conditions'' this is not sà with diffusive flames. FoÌlowing the work of Burke and Schumann? who set forth the theory of diffusional combustion and the work of Shvab and Zel'dovichs, who established the general properties of diffusion flames, most of the work has been .""..",t".0 in the counter-flow diffusion flamese'ro ' Senior Research9r, Combustion and

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Diffusional Combustion of Gases

Cited by 3 publications

References 20 publications

Numerical analysis of the bistable propagation of lean premixed hydrogen flames

Numerical analysis of the bistable propagation of lean premixed hydrogen flames

Unsteady Planar Diffusion Flames: Ignition, Travel, Burnout

Cylindrical diffusion laminar flames

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