Confined superadiabatic premixed flame-flow interaction

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Description

Laminar premixed unity-Lewis number flames are studied numerically, to examine flow-flame interaction in a two-dimensional closed domain. Two opposed planar flame fronts are perturbed sinusoidally and allowed to develop by consuming premixed reactants. Combustion heat release leads to global pressure and temperature rise in the domain, due to confinement. A superadiabatic condition, with products temperature rising with distance behind the flame front, is observed due to stagnation pressure rise. Variations in tangential strain rate behind the perturbed flame fronts, due to flame curvature and heat release, result in a modified local superadiabatic temperature gradient in the products. These variations in ... continued below

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25 p.

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Najm, H. N. December 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Livermore, CA (United States)
    Place of Publication: Livermore, California

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Description

Laminar premixed unity-Lewis number flames are studied numerically, to examine flow-flame interaction in a two-dimensional closed domain. Two opposed planar flame fronts are perturbed sinusoidally and allowed to develop by consuming premixed reactants. Combustion heat release leads to global pressure and temperature rise in the domain, due to confinement. A superadiabatic condition, with products temperature rising with distance behind the flame front, is observed due to stagnation pressure rise. Variations in tangential strain rate behind the perturbed flame fronts, due to flame curvature and heat release, result in a modified local superadiabatic temperature gradient in the products. These variations in temperature gradients are shown to determine the net local confinement-heating rate in the products, leading to corresponding deviations in products temperature, and the local reaction rate along the flame front. These observations, which are not consistent with one-dimensional superadiabatic stagnation flame behavior, are a direct result of the unrestrained unsteady nature of two-dimensional flame-flow interaction.

Physical Description

25 p.

Notes

OSTI as DE97051377

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  • Other Information: PBD: [1995]

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  • Other: DE97051377
  • Report No.: SAND--95-8605C
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/661463 | External Link
  • Office of Scientific & Technical Information Report Number: 661463
  • Archival Resource Key: ark:/67531/metadc706095

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  • December 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 17, 2015, 5:58 p.m.

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Najm, H. N. Confined superadiabatic premixed flame-flow interaction, report, December 1995; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc706095/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.