Turbulence effects on cellular burning structures in lean premixed hydrogen flames

Journal Article · Fri May 15 04:00:00 EDT 2009 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2008.10.029· OSTI ID:21168997

Day, Marc; Bell, John; Beckner, Vince; Lijewski, Michael ^[1]; Bremer, Peer-Timo ^[2]; Pascucci, Valerio ^[3]

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1. Lawrence Berkeley National Laboratory, Mailstop 50A-1148, One Cyclotron Road, Berkeley, CA 94720 (United States)
2. Lawrence Livermore National Laboratory, Box 808, L-560, Livermore, CA 94551-0808 (United States)
3. Scientific Computing and Imaging Institute, University of Utah, 72 S Central Campus Drive, 3750 WEB, Salt Lake City, UT 84112 (United States)

We present numerical simulations of lean hydrogen flames interacting with turbulence. The simulations are performed in an idealized setting using an adaptive low Mach number model with a numerical feedback control algorithm to stabilize the flame. At the conditions considered here, hydrogen flames are thermodiffusively unstable, and burn in cellular structures. For that reason, we consider two levels of turbulence intensity and a case without turbulence whose dynamics is driven by the natural flame instability. An overview of the flame structure shows that the burning in the cellular structures is quite intense, with the burning patches separated by regions in which the flame is effectively extinguished. We explore the geometry of the flame surface in detail, quantifying the mean and Gaussian curvature distributions and the distribution of the cell sizes. We next characterize the local flame speed to quantify the effect of flame intensification on local propagation speed. We then introduce several diagnostics aimed at quantifying both the level of intensification and diffusive mechanisms that lead to the intensification. (author)

• OSTI ID: 21168997
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 5 Vol. 156; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CONTROL
DISTRIBUTION
FEEDBACK
FLAME PROPAGATION
FLAMES
GEOMETRY
HYDROGEN
INSTABILITY
Morse theory
SHAPE
SIMULATION
SIZE
SURFACES
TURBULENCE