Correlation of flame speed with stretch in turbulent premixed methane/air flames

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Direct numerical simulations of two-dimensional unsteady premixed methane/air flames are performed to determine the correlation of flame speed with stretch over a wide range of curvatures and strain rates generated by intense two-dimensional turbulence. Lean and stoichiometric premixtures are considered with a detailed C{sub 1}-mechanism for methane oxidation. The computed correlation shows the existence of two distinct stable branches. It further shows that exceedingly large negative values of stretch can be obtained solely through curvature effects which give rise to an overall nonlinear correlation of the flame speed with stretch. Over a narrower stretch range, {minus}1 {le} Ka {le} 1, ... continued below

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28 p.

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Chen, J.H. & Im, H.G. March 1, 1998.

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Direct numerical simulations of two-dimensional unsteady premixed methane/air flames are performed to determine the correlation of flame speed with stretch over a wide range of curvatures and strain rates generated by intense two-dimensional turbulence. Lean and stoichiometric premixtures are considered with a detailed C{sub 1}-mechanism for methane oxidation. The computed correlation shows the existence of two distinct stable branches. It further shows that exceedingly large negative values of stretch can be obtained solely through curvature effects which give rise to an overall nonlinear correlation of the flame speed with stretch. Over a narrower stretch range, {minus}1 {le} Ka {le} 1, which includes 90% of the sample, the correlation is approximately linear, and hence, the asymptotic theory for stretch is practically applicable. Overall, one-third of the sample has negative stretch. In this linear range, the Markstein number associated with the positive branch is determined and is consistent with values obtained from comparable steady counterflow computations. In addition to this conventional positive branch, a negative branch is identified. This negative branch occurs when a flame cusp, with a center of curvature in the burnt gases, is subjected to intense compressive strain, resulting in a negative displacement speed. Negative flame speeds are also encountered for extensive tangential strain rates exceeding a Karlovitz number of unity, a value consistent with steady counterflow computations.

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28 p.

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OSTI as DE98052542

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  • 27. international symposium on combustion, Boulder, CO (United States), 2-7 Aug 1998

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  • Other: DE98052542
  • Report No.: SAND--98-8473C
  • Report No.: CONF-980804--
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 671895
  • Archival Resource Key: ark:/67531/metadc710908

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 15, 2015, 5:02 p.m.

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Chen, J.H. & Im, H.G. Correlation of flame speed with stretch in turbulent premixed methane/air flames, article, March 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc710908/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.