Journal
COMBUSTION AND FLAME
Volume 155, Issue 1-2, Pages 2-20Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2008.08.006
Keywords
Premixed flame; Mesoscale combustion; Flame instabilities; Intermittency; Spatiotemporal oscillations; Cellular instabilities; Mild combustion; Spectral element method
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Funding
- Swiss National Foundation [200021-109398]
- Paul Scherrer Institute
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Direct numerical Simulation with detailed chemistry and transport is used to study the stabilization and dynamics of lean (phi = 0.5) premixed hydrogen/air atmospheric pressure flames in mesoscale planar channels. Channel heights of h = 2, 4, and 7 mm, and inflow velocities in the range 0.3 <= U-IN <= 1100 cm/s are investigated. Six different burning modes are identified: mild combustion, ignition/extinction, closed steady symmetric flames, open steady symmetric flames, oscillating and, finally, asymmetric flames. Chaotic behavior of cellular flame structures is observed for certain values Of U-IN. Stability maps delineating the regions of the different flame types are finally constructed. (c) 2008 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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