Simultaneous laser-induced fluorescence and Rayleigh scattering measurements of structure in partially premixed flames

N. H. Heberle; G. P. Smith; J. B. Jeffries; D. R. Crosley; R. W. Dibble

doi:10.1007/s003400000407

Simultaneous laser-induced fluorescence and Rayleigh scattering measurements of structure in partially premixed flames

N. H. Heberle, G. P. Smith, J. B. Jeffries, D. R. Crosley^*, R. W. Dibble

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Laser-induced fluorescence and Rayleigh scattering measurements were made in well-stabilized, laminar partially premixed Bunsen-type methane/air flames. Simultaneous Rayleigh scattering (temperature) and laser-induced fluorescence (flame radical concentration) enable precise determination of the position of CH and OH radical structures in the gradient of the flame temperature. The OH and CH structures in the straight walls of the premixed inner flame cone are well described by models incorporating detailed flame chemistry and one-dimensional transport. Near the tip of the inner cone in regions of increased flame stretch, at richer stoichiometries of the premixed portion of the flames, and in flames perturbed by a metal insert, the measured structure of CH and OH deviates from this simple description. CH concentrations predicted by the model depend on flow rate, thus suggesting the importance of strain rate to prompt NO_x formation in these flames.

Original language	English (US)
Pages (from-to)	733-740
Number of pages	8
Journal	Applied Physics B: Lasers and Optics
Volume	71
Issue number	5
DOIs	https://doi.org/10.1007/s003400000407
State	Published - Nov 2000
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)
General Physics and Astronomy

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Cite this

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title = "Simultaneous laser-induced fluorescence and Rayleigh scattering measurements of structure in partially premixed flames",

abstract = "Laser-induced fluorescence and Rayleigh scattering measurements were made in well-stabilized, laminar partially premixed Bunsen-type methane/air flames. Simultaneous Rayleigh scattering (temperature) and laser-induced fluorescence (flame radical concentration) enable precise determination of the position of CH and OH radical structures in the gradient of the flame temperature. The OH and CH structures in the straight walls of the premixed inner flame cone are well described by models incorporating detailed flame chemistry and one-dimensional transport. Near the tip of the inner cone in regions of increased flame stretch, at richer stoichiometries of the premixed portion of the flames, and in flames perturbed by a metal insert, the measured structure of CH and OH deviates from this simple description. CH concentrations predicted by the model depend on flow rate, thus suggesting the importance of strain rate to prompt NOx formation in these flames.",

author = "Heberle, {N. H.} and Smith, {G. P.} and Jeffries, {J. B.} and Crosley, {D. R.} and Dibble, {R. W.}",

year = "2000",

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TY - JOUR

T1 - Simultaneous laser-induced fluorescence and Rayleigh scattering measurements of structure in partially premixed flames

AU - Heberle, N. H.

AU - Smith, G. P.

AU - Jeffries, J. B.

AU - Crosley, D. R.

AU - Dibble, R. W.

PY - 2000/11

Y1 - 2000/11

N2 - Laser-induced fluorescence and Rayleigh scattering measurements were made in well-stabilized, laminar partially premixed Bunsen-type methane/air flames. Simultaneous Rayleigh scattering (temperature) and laser-induced fluorescence (flame radical concentration) enable precise determination of the position of CH and OH radical structures in the gradient of the flame temperature. The OH and CH structures in the straight walls of the premixed inner flame cone are well described by models incorporating detailed flame chemistry and one-dimensional transport. Near the tip of the inner cone in regions of increased flame stretch, at richer stoichiometries of the premixed portion of the flames, and in flames perturbed by a metal insert, the measured structure of CH and OH deviates from this simple description. CH concentrations predicted by the model depend on flow rate, thus suggesting the importance of strain rate to prompt NOx formation in these flames.

AB - Laser-induced fluorescence and Rayleigh scattering measurements were made in well-stabilized, laminar partially premixed Bunsen-type methane/air flames. Simultaneous Rayleigh scattering (temperature) and laser-induced fluorescence (flame radical concentration) enable precise determination of the position of CH and OH radical structures in the gradient of the flame temperature. The OH and CH structures in the straight walls of the premixed inner flame cone are well described by models incorporating detailed flame chemistry and one-dimensional transport. Near the tip of the inner cone in regions of increased flame stretch, at richer stoichiometries of the premixed portion of the flames, and in flames perturbed by a metal insert, the measured structure of CH and OH deviates from this simple description. CH concentrations predicted by the model depend on flow rate, thus suggesting the importance of strain rate to prompt NOx formation in these flames.

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Simultaneous laser-induced fluorescence and Rayleigh scattering measurements of structure in partially premixed flames

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