Effect of equivalence ratio on premixed flame response to unsteady strain-rate and curvature

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Description

The interaction of a premixed stoichiometric methane-air flame with a two-dimensional counter-rotating vortex pair is studied under stoichiometric and rich conditions using a detailed C{sub 1}C{sub 2} chemical mechanism. The focus is on the effect of equivalence ratio on flame response to unsteady strain-rate and curvature. Flame structure and transient response are studied, both at curved cusps and on the vortex-pair centerline. The rich flame is found to exhibit faster response to flow disturbances. Results suggest this is due to the increased sensitivity of the flame to H concentration at rich conditions. Significant differences are observed in the unsteady behavior ... continued below

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27 p.

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Najm, H.N.; Wyckoff, P.S. & Knio, O.M. March 1, 1998.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 13 times , with 5 in the last month . More information about this report can be viewed below.

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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

The interaction of a premixed stoichiometric methane-air flame with a two-dimensional counter-rotating vortex pair is studied under stoichiometric and rich conditions using a detailed C{sub 1}C{sub 2} chemical mechanism. The focus is on the effect of equivalence ratio on flame response to unsteady strain-rate and curvature. Flame structure and transient response are studied, both at curved cusps and on the vortex-pair centerline. The rich flame is found to exhibit faster response to flow disturbances. Results suggest this is due to the increased sensitivity of the flame to H concentration at rich conditions. Significant differences are observed in the unsteady behavior of some C{sub 2} species, where substantial transient accumulation is observed at stoichiometric conditions, but not at rich conditions. Transient response of flame observables, such as CH, OH, and HCO, is studied and compared to experimental data.

Physical Description

27 p.

Notes

OSTI as DE98052515

Source

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

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  • Other: DE98052515
  • Report No.: SAND--98-8461C
  • Report No.: CONF-980804--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/658163 | External Link
  • Office of Scientific & Technical Information Report Number: 658163
  • Archival Resource Key: ark:/67531/metadc709318

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  • March 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2016, 8:16 p.m.

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Najm, H.N.; Wyckoff, P.S. & Knio, O.M. Effect of equivalence ratio on premixed flame response to unsteady strain-rate and curvature, report, March 1, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc709318/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.