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Title: Flame front geometry in premixed turbulent flames

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.
Authors:
 [1] ;  [2]
  1. Lawrence Berkeley Lab., CA (United States)
  2. Sandia National Labs., Livermore, CA (United States)
Publication Date:
OSTI Identifier:
10134366
Report Number(s):
LBL--31590; CONF-920707--26; SAND--92-8504C
ON: DE92010310
DOE Contract Number:
AC03-76SF00098; AC04-76DR00789
Resource Type:
Conference
Resource Relation:
Conference: 24. international symposium on combustion,Sydney (Australia),5-10 Jul 1992; Other Information: PBD: Dec 1991
Research Org:
Lawrence Berkeley Lab., CA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; METHANE; FLAME PROPAGATION; ETHYLENE; TURBULENCE; FLAMES; NUMERICAL SOLUTION 400800; COMBUSTION, PYROLYSIS, AND HIGH-TEMPERATURE CHEMISTRY