Large eddy simulation and laser diagnostic studies on a low swirl stratified premixed flame

Journal Article · Thu Jan 15 04:00:00 EST 2009 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2008.06.014· OSTI ID:21227372

Nogenmyr, K -J; Bai, X S ^[1]; Fureby, C ^[2]; Petersson, P; Collin, R; Linne, M ^[3]

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1. Department of Energy Sciences, Lund Institute of Technology, Box 118, 22100 Lund (Sweden)
2. Division of Weapons and Protection, Swedish Defense Research Agency Y FOI, Stockholm (Sweden)
3. Department of Combustion Physics, Lund Institute of Technology, Lund (Sweden)

This paper presents numerical simulations and laser diagnostic experiments of a swirling lean premixed methane/air flame with an aim to compare different Large Eddy Simulations (LES) models for reactive flows. An atmospheric-pressure laboratory swirl burner has been developed wherein lean premixed methane/air is injected in an unconfined low-speed flow of air. The flame is stabilized above the burner rim in a moderate swirl flow, triggering weak vortex breakdown in the downstream direction. Both stereoscopic (3-component) PIV and 2-component PIV are used to investigate the flow. Filtered Rayleigh scattering is used to examine the temperature field in the leading flame front. Acetone-Planar Laser Induced Fluorescence (PLIF) is applied to examine the fuel distribution. The experimental data are used to assess two different LES models; one based on level-set G-equation and flamelet chemistry, and the other based on finite rate chemistry with reduced kinetics. The two LES models treat the chemistry differently, which results in different predictions of the flame dynamic behavior and statistics. Yet, great similarity of flame structures was predicted by both models. The LES and experimental data reveal several intrinsic features of the low swirl flame such as the W-shape at the leading front, the highly wrinkled fronts in the shear layers, and the existence of extinction holes in the trailing edge of the flame. The effect of combustion models, the numerical solvers and boundary conditions on the flame and flow predictions was systematically examined. (author)

• OSTI ID: 21227372
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1 Vol. 156; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AIR
ATMOSPHERIC PRESSURE
BOUNDARY CONDITIONS
BURNERS
COMBUSTION KINETICS
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
FLAMES
FORECASTING
LARGE EDDY SIMULATION
LAYERS
MATHEMATICAL MODELS
METHANE
SHAPE
SIMULATION
STATISTICS
TEMPERATURE DISTRIBUTION
VORTEX FLOW
VORTICES