The local structure of turbulent nonpremixed flames near extinction

A. R. Masri; R. W. Bilger; Robert Dibble

doi:10.1016/0010-2180(90)90024-L

The local structure of turbulent nonpremixed flames near extinction

A. R. Masri^*, R. W. Bilger, Robert Dibble

^*Corresponding author for this work

Physical Sciences and Engineering

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

32 Scopus citations

Abstract

Using reported data collected in turbulent jet nonpremixed flames near extinction, various parameters are derived to characterize the structure of the flames as they approach blowoff. The fuels considered are CH₄, H₂, H₂ Ar, and CO/H₂/N₂. The data used consist of velocity and turbulence measurements using the LDA technique and measurements of temperature, species mass fractions, and mixture fraction using the spontaneous Raman-Rayleigh scattering technique. Flames of H₂ Ar and CO/H₂/N₂ fuels exhibit a monomodal behavior in the pdfs of their reactive scalars as they approach extinction while those of CH₄ flames are bimodal. The parameters controlling this behavior are the width of the reaction zone, Δξ_R and the scalar scale of turbulence Σ_ξ. It is found that this behavior is only slightly affected by Σ_ξ and is mainly dependent on Δξ_R. Further investigations of other fuels with a range of Δξ_R are recommended.

Original language	English (US)
Pages (from-to)	260-276
Number of pages	17
Journal	Combustion and Flame
Volume	81
Issue number	3-4
DOIs	https://doi.org/10.1016/0010-2180(90)90024-L
State	Published - Jan 1 1990

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Fuel Technology
Energy Engineering and Power Technology
Physics and Astronomy(all)

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10.1016/0010-2180(90)90024-L

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title = "The local structure of turbulent nonpremixed flames near extinction",

abstract = "Using reported data collected in turbulent jet nonpremixed flames near extinction, various parameters are derived to characterize the structure of the flames as they approach blowoff. The fuels considered are CH4, H2, H2 Ar, and CO/H2/N2. The data used consist of velocity and turbulence measurements using the LDA technique and measurements of temperature, species mass fractions, and mixture fraction using the spontaneous Raman-Rayleigh scattering technique. Flames of H2 Ar and CO/H2/N2 fuels exhibit a monomodal behavior in the pdfs of their reactive scalars as they approach extinction while those of CH4 flames are bimodal. The parameters controlling this behavior are the width of the reaction zone, ΔξR and the scalar scale of turbulence Σξ. It is found that this behavior is only slightly affected by Σξ and is mainly dependent on ΔξR. Further investigations of other fuels with a range of ΔξR are recommended.",

author = "Masri, {A. R.} and Bilger, {R. W.} and Robert Dibble",

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doi = "10.1016/0010-2180(90)90024-L",

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T1 - The local structure of turbulent nonpremixed flames near extinction

AU - Masri, A. R.

AU - Bilger, R. W.

AU - Dibble, Robert

PY - 1990/1/1

Y1 - 1990/1/1

N2 - Using reported data collected in turbulent jet nonpremixed flames near extinction, various parameters are derived to characterize the structure of the flames as they approach blowoff. The fuels considered are CH4, H2, H2 Ar, and CO/H2/N2. The data used consist of velocity and turbulence measurements using the LDA technique and measurements of temperature, species mass fractions, and mixture fraction using the spontaneous Raman-Rayleigh scattering technique. Flames of H2 Ar and CO/H2/N2 fuels exhibit a monomodal behavior in the pdfs of their reactive scalars as they approach extinction while those of CH4 flames are bimodal. The parameters controlling this behavior are the width of the reaction zone, ΔξR and the scalar scale of turbulence Σξ. It is found that this behavior is only slightly affected by Σξ and is mainly dependent on ΔξR. Further investigations of other fuels with a range of ΔξR are recommended.

AB - Using reported data collected in turbulent jet nonpremixed flames near extinction, various parameters are derived to characterize the structure of the flames as they approach blowoff. The fuels considered are CH4, H2, H2 Ar, and CO/H2/N2. The data used consist of velocity and turbulence measurements using the LDA technique and measurements of temperature, species mass fractions, and mixture fraction using the spontaneous Raman-Rayleigh scattering technique. Flames of H2 Ar and CO/H2/N2 fuels exhibit a monomodal behavior in the pdfs of their reactive scalars as they approach extinction while those of CH4 flames are bimodal. The parameters controlling this behavior are the width of the reaction zone, ΔξR and the scalar scale of turbulence Σξ. It is found that this behavior is only slightly affected by Σξ and is mainly dependent on ΔξR. Further investigations of other fuels with a range of ΔξR are recommended.

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EP - 276

JO - Combustion and Flame

JF - Combustion and Flame

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ER -

The local structure of turbulent nonpremixed flames near extinction

Abstract

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