Laser Raman scattering measurements of differential molecular diffusion in turbulent nonpremixed jet flames of H2 CO2 fuel

L. L. Smith; R. W. Dibble; L. Talbot; R. S. Barlow; C. D. Carter

doi:10.1016/0010-2180(94)00066-2

Laser Raman scattering measurements of differential molecular diffusion in turbulent nonpremixed jet flames of H₂ CO₂ fuel

L. L. Smith, R. W. Dibble^*, L. Talbot, R. S. Barlow, C. D. Carter

^*Corresponding author for this work

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

78 Scopus citations

Abstract

In this paper we explore the effects of differential diffusion in nonpremixed turbulent jet flames. Pulsed Raman scattering spectroscopy is used to measure temperature and species concentrations in chemically reacting jets of H₂ CO₂ into air, over a range of jet Reynolds numbers from 1,000 to 30,000 based on cold jet fluid properties. Results show significant effects of differential diffusion at all jet Reynolds numbers considered. Differential diffusion between H₂ and CO₂ produces differences between the hydrogen element mixture fraction (ξ_H) and the carbon element mixture fraction (ξ_C). The greatest effects occur on the rich side of stoichiometric, where ξ_H is observed to be smaller than ξ_C at all Reynolds numbers. Differential diffusion between H₂ and H₂O creates a net flux of hydrogen element toward the stoichiometric contour and causes a local maximum in ξ_H that occurs near the stoichiometric condition. A differential diffusion variable z_H is defined as the difference between ξ_H and ξ_C. The variance of z_H conditional on ξ_C also shows that differential diffusion effects are greatest on the rich side of the flame. Conditional variances of z_H are largest at intermediate Reynolds numbers.

Original language	English (US)
Pages (from-to)	153-160
Number of pages	8
Journal	Combustion and Flame
Volume	100
Issue number	1-2
DOIs	https://doi.org/10.1016/0010-2180(94)00066-2
State	Published - Jan 1995
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Fuel Technology
Energy Engineering and Power Technology
General Physics and Astronomy

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10.1016/0010-2180(94)00066-2

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title = "Laser Raman scattering measurements of differential molecular diffusion in turbulent nonpremixed jet flames of H2 CO2 fuel",

abstract = "In this paper we explore the effects of differential diffusion in nonpremixed turbulent jet flames. Pulsed Raman scattering spectroscopy is used to measure temperature and species concentrations in chemically reacting jets of H2 CO2 into air, over a range of jet Reynolds numbers from 1,000 to 30,000 based on cold jet fluid properties. Results show significant effects of differential diffusion at all jet Reynolds numbers considered. Differential diffusion between H2 and CO2 produces differences between the hydrogen element mixture fraction (ξH) and the carbon element mixture fraction (ξC). The greatest effects occur on the rich side of stoichiometric, where ξH is observed to be smaller than ξC at all Reynolds numbers. Differential diffusion between H2 and H2O creates a net flux of hydrogen element toward the stoichiometric contour and causes a local maximum in ξH that occurs near the stoichiometric condition. A differential diffusion variable zH is defined as the difference between ξH and ξC. The variance of zH conditional on ξC also shows that differential diffusion effects are greatest on the rich side of the flame. Conditional variances of zH are largest at intermediate Reynolds numbers.",

author = "Smith, {L. L.} and Dibble, {R. W.} and L. Talbot and Barlow, {R. S.} and Carter, {C. D.}",

note = "Funding Information: The authors acknowledge Prof J. Y. Chen, of the University of California at Berkeley, for his assistance with the laminar flame calculations. Dr. Alan Kerstein, Prof. Marshall Long, and Prof. Noel Clemens contributed helpful discussions. The University of California researchers were supported by the National Science Foundation under grant number CTS-9107719. L. L. Smith was supported in part by a fellowship from Associated Western Universities. Research at the Combustion Research Facility was funded by the United States Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences.",

year = "1995",

month = jan,

doi = "10.1016/0010-2180(94)00066-2",

language = "English (US)",

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pages = "153--160",

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AU - Smith, L. L.

AU - Dibble, R. W.

AU - Talbot, L.

AU - Barlow, R. S.

AU - Carter, C. D.

N1 - Funding Information: The authors acknowledge Prof J. Y. Chen, of the University of California at Berkeley, for his assistance with the laminar flame calculations. Dr. Alan Kerstein, Prof. Marshall Long, and Prof. Noel Clemens contributed helpful discussions. The University of California researchers were supported by the National Science Foundation under grant number CTS-9107719. L. L. Smith was supported in part by a fellowship from Associated Western Universities. Research at the Combustion Research Facility was funded by the United States Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences.

PY - 1995/1

Y1 - 1995/1

N2 - In this paper we explore the effects of differential diffusion in nonpremixed turbulent jet flames. Pulsed Raman scattering spectroscopy is used to measure temperature and species concentrations in chemically reacting jets of H2 CO2 into air, over a range of jet Reynolds numbers from 1,000 to 30,000 based on cold jet fluid properties. Results show significant effects of differential diffusion at all jet Reynolds numbers considered. Differential diffusion between H2 and CO2 produces differences between the hydrogen element mixture fraction (ξH) and the carbon element mixture fraction (ξC). The greatest effects occur on the rich side of stoichiometric, where ξH is observed to be smaller than ξC at all Reynolds numbers. Differential diffusion between H2 and H2O creates a net flux of hydrogen element toward the stoichiometric contour and causes a local maximum in ξH that occurs near the stoichiometric condition. A differential diffusion variable zH is defined as the difference between ξH and ξC. The variance of zH conditional on ξC also shows that differential diffusion effects are greatest on the rich side of the flame. Conditional variances of zH are largest at intermediate Reynolds numbers.

AB - In this paper we explore the effects of differential diffusion in nonpremixed turbulent jet flames. Pulsed Raman scattering spectroscopy is used to measure temperature and species concentrations in chemically reacting jets of H2 CO2 into air, over a range of jet Reynolds numbers from 1,000 to 30,000 based on cold jet fluid properties. Results show significant effects of differential diffusion at all jet Reynolds numbers considered. Differential diffusion between H2 and CO2 produces differences between the hydrogen element mixture fraction (ξH) and the carbon element mixture fraction (ξC). The greatest effects occur on the rich side of stoichiometric, where ξH is observed to be smaller than ξC at all Reynolds numbers. Differential diffusion between H2 and H2O creates a net flux of hydrogen element toward the stoichiometric contour and causes a local maximum in ξH that occurs near the stoichiometric condition. A differential diffusion variable zH is defined as the difference between ξH and ξC. The variance of zH conditional on ξC also shows that differential diffusion effects are greatest on the rich side of the flame. Conditional variances of zH are largest at intermediate Reynolds numbers.

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ER -

Laser Raman scattering measurements of differential molecular diffusion in turbulent nonpremixed jet flames of H₂ CO₂ fuel

Abstract

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