Flame front geometry in premixed turbulent flames

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Experimental and numerical determinations of flame front curvature and orientation in premixed turbulent flames are presented. The experimental data is obtained from planar, cross sectional images of stagnation point flames at high Damkoehler number. A direct numerical simulation of a constant energy flow is combined with a zero-thickness, constant density flame model to provide the numerical results. The computational domain is a 32{sup 3} cube with periodic boundary conditions. The two-dimensional curvature distributions of the experiments and numerical simulations compare well at similar q{prime}/S{sub L} values with means close to zero and marked negative skewness. At higher turbulence levels the ... continued below

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Pages: (18 p)

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Shepherd, I.G. (Lawrence Berkeley Lab., CA (United States)) & Ashurst, W.T. (Sandia National Labs., Livermore, CA (United States)) December 1, 1991.

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Experimental and numerical determinations of flame front curvature and orientation in premixed turbulent flames are presented. The experimental data is obtained from planar, cross sectional images of stagnation point flames at high Damkoehler number. A direct numerical simulation of a constant energy flow is combined with a zero-thickness, constant density flame model to provide the numerical results. The computational domain is a 32{sup 3} cube with periodic boundary conditions. The two-dimensional curvature distributions of the experiments and numerical simulations compare well at similar q{prime}/S{sub L} values with means close to zero and marked negative skewness. At higher turbulence levels the simulations show that the distributions become symmetric about zero. These features are also found in the three dimensional distributions of curvature. The simulations support assumptions which make it possible to determine the mean direction cosines from the experimental data. This leads to a reduction of 12% in the estimated flame surface area density in the middle of the flame brush. 18 refs.

Physical Description

Pages: (18 p)

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OSTI; NTIS; GPO Dep.

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  • 24. international symposium on combustion, Sydney (Australia), 5-10 Jul 1992

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  • Other: DE92010310
  • Report No.: LBL-31590
  • Report No.: CONF-920707--26
  • Report No.: SAND--92-8504C
  • Grant Number: AC03-76SF00098
  • Grant Number: AC04-76DR00789
  • Office of Scientific & Technical Information Report Number: 5573326
  • Archival Resource Key: ark:/67531/metadc1092980

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 1, 1991

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  • Feb. 10, 2018, 10:06 p.m.

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  • April 25, 2018, 6:01 p.m.

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Shepherd, I.G. (Lawrence Berkeley Lab., CA (United States)) & Ashurst, W.T. (Sandia National Labs., Livermore, CA (United States)). Flame front geometry in premixed turbulent flames, article, December 1, 1991; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1092980/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.