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Effects of Large-Scale Stretching on Turbulent Flame Speed

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1210
pages 573-576

Andrei N. Lipatnikov
Department of Applied Mechanics, Chalmers University of Technology, 41296, Gothenburg, Sweden

J. Chomiak
Department of Applied Mechanics, Chalmers University of Technology, 41296, Gothenburg, Sweden

Abstract

By analyzing expanding statistically spherical premixed turbulent flames, it is shown that the large-scale stretching of such a flame by spatially non-uniform mean flow substantially reduces flame speed as compared with the statistically planar flame, all other things being equal. This result implies that stretching of subfilter flame by large-scale turbulent eddies resolved in LES may substantially reduce the subfilter flame speed.

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