Influence of H2 on the response of lean premixed CH4 flames to high strained flows

Jackson, Gregory S.; Sai, Roxanne; Plaia, Joseph M; Boggs, Christopher; Kiger, Ken

doi:10.1016/s0010-2180(02)00496-0

Cited by 176 publications

(60 citation statements)

References 14 publications

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“…The addition of hydrogen to methane results in a more reactive faster burning fuel, this has been demonstrated by a number of previous studies ( [2], [3], [19]. [24] to reference a few) and is confirmed here in both laminar and turbulent conditions. However, it is not clear how significant flowfield stretch effects are on turbulent premixed flames, there is evidence here that they can be neglected but also some plots show that they may be significant.…”

Section: As a Results The Uncertainty In Measurements Ofsupporting

confidence: 85%

“…There is a discontinuity at  = 1 where the deficient reactant changes from the fuel to oxygen, and there are difficulties in its definition when dealing with multicomponent fuels. Although a combined hydrogen/methane Lewis number has been calculated Jackson et al [24] it has not been widely adopted, principally because such global Lewis numbers neglect the diffusion of radicals through the flame (e.g. H, OH and O) which are important in initiating combustion by chain branching reactions [25].…”

Section: Resultsmentioning

confidence: 99%

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Turbulent burning rates of methane and methane–hydrogen mixtures

Fairweather

Ormsby

Sheppard

et al. 2009

Combustion and Flame

107

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Section: As a Results The Uncertainty In Measurements Ofsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Turbulent burning rates of methane and methane–hydrogen mixtures

Fairweather

Ormsby

Sheppard

et al. 2009

Combustion and Flame

107

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“…Experimental and computational studies performed in simplified flow configurations (freely and spherically propagating flames, counterflow flames, Bunsen-type and slot burners) have shown that the hydrogen addition to methane increases the laminar burning velocity (i.e., the flame reactivity) [5][6][7][8][9][10], the resistance to strain extinction [1,[5][6][7]9,11] and the flame front wrinkling (i.e., the flame surface area) [4,7], thus enhancing robustness and stability of the flame. These positive effects have been attributed to the increase in both flame temperature (thermal effects) and supply of active radicals (chemical effects).…”

Section: Introductionmentioning

confidence: 99%

“…These positive effects have been attributed to the increase in both flame temperature (thermal effects) and supply of active radicals (chemical effects). Also, hydrogen-induced non-equidiffusive effects (i.e., non-unity Lewis number and preferential diffusion) have been invoked for lean flames [4][5][6][7]11].…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved Particle Image Velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures

Sarli

Benedetto

Long

et al. 2012

International Journal of Hydrogen Energy

126

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Additional Information:• NOTICE: this is the author's version of a work that was accepted for publication in the International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was sub- Regardless of the mixture stoichiometry, the hydrogen substitution to methane leads to a transition from a regime in which the vortex only wrinkles the flame front (x H2 < 0.2) to a * Corresponding author. Phone: +39 0817622673; Fax: +39 0817622915; E-mail address: valeria.disarli@irc.cnr.it 3 more vigorous regime in which the interaction almost results in the separation of small flame pockets from the main front (x H2 > 0.2). This transition was characterised in terms of time histories of flame surface area and burning rate.

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“…It has been shown that hydrogen enrichment can improve flame stability and thus reduce NO x f o r m a t i o ni np r e m i x e dfl a m e s [1][2][3][4][5], as well as increase burning velocity [6][7][8]. For diffusion combustion, hydrogen enrichment can suppress the formation of soot particles [9,10] and shorten ignition delay [11,12].…”

Section: Introductionmentioning

confidence: 99%

A numerical study on the effect of hydrogen/reformate gas addition on flame temperature and NO formation in strained methane/air diffusion flames

Guo¹,

Neill²

2009

Combustion and Flame

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A numerical study on the effect of hydrogen/reformate gas addition on flame temperature and NO formation in strained methane/air diffusion flames Guo, Hongsheng; Neill, W. Stuart This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. This paper investigates the effects of hydrogen/reformate gas addition on flame temperature and NO formation in strained methane/air diffusion flames by numerical simulation. The results reveal that flame temperature changes due to the combined effects of adiabatic temperature, fuel Lewis number and radiation heat loss, when hydrogen/reformate gas is added to the fuel of a methane/air diffusion flame. The effect of Lewis number causes the flame temperature to increase much faster than the corresponding adiabatic equilibrium temperature when hydrogen is added, and results in a qualitatively different variation from the adiabatic equilibrium temperature as reformate gas is added. At some conditions, the addition of hydrogen results in a super-adiabatic flame temperature. The addition of hydrogen/reformate gas causes NO formation to change because of the variations in flame temperature, structure and NO formation mechanism, and the effect becomes more significant with increasing strain rate. The addition of a small amount of hydrogen or reformate gas has little effect on NO formation at low strain rates, and results in an increase in NO formation at moderate or high strain rates. However, the addition of a large amount of hydrogen increases NO formation at all strain rates, except near pure hydrogen condition. Conversely, the addition of a large amount of reformate gas results in a reduction in NO formation.Crown

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Influence of H2 on the response of lean premixed CH4 flames to high strained flows

Cited by 176 publications

References 14 publications

Turbulent burning rates of methane and methane–hydrogen mixtures

Turbulent burning rates of methane and methane–hydrogen mixtures

Time-Resolved Particle Image Velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures

A numerical study on the effect of hydrogen/reformate gas addition on flame temperature and NO formation in strained methane/air diffusion flames

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