Interactions between turbulence and flames in premixed reacting flows

• DOI: 10.1063/1.3671736
• Publication Date: 2012-01-03T21:08:40Z
• Authors: Peter E. Hamlington; Alexei Y. Poludnenko; Elaine S. Oran
• Keywords: Flame structure

The interactions between turbulence and flames in premixed reacting flows are studied for a broad range of intensities by analyzing scalar (reactant mass-fraction) gradient, vorticity, strain rate fields. analysis is based on fully compressible, three-dimensional numerical simulations H2-air combustion an unconfined domain. For low intensities, flame reconstruction method the gradient shows that internal structure similar to laminar flame, while magnitudes vorticity suppressed heat release there substantial anisotropy orientation intense vortical structures. As intensity increases, local becomes increasingly isotropic, preheat zone substantially broadened. There is, however, relatively little broadening reaction zone, even high intensities. At only weakly affected their with those found nonreacting turbulence. A decomposition total into components due suppression depends relative alignment surface normal. This effect used explain vortices at also reveals separate effects turbulent dilatational straining width.