Dynamics of premixed hydrogen/air flames in mesoscale channels

作者：Pizza Gianmarco; Frouzakis Christos E^*; Mantzaras John; Tomboulides Ananias G; Boulouchos Konstantinos

来源：Combustion and Flame, 2008, 155(1-2): 2-20.

DOI：10.1016/j.combustflame.2008.08.006

• Premixed flame
• Mesoscale combustion
• Flame instabilities
• Intermittency
• Spatiotemporal oscillations
• Cellular instabilities
• Mild combustion
• Spectral element method

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.

• 出版日期2008-10