Isolating effects of Darrieus–Landau instability on the morphology and propagation of turbulent premixed flames

The objective of this work is to provide physical insight into the mechanisms governing flame–turbulence interactions and explore impact ubiquitous Darrieus–Landau instability on propagation. It based hydrodynamic theory premixed flames that considers flame thickness much smaller than all other fluidynamical length scales. In asymptotic limit, thus confined a surface whilst diffusion reaction processes occurring inside zone are accounted for by two parameters: unburned-to-burned density ratio Markstein length. robust model, which free phenomenology turbulence modelling assumptions, makes transparent mutual between fluid flow, permits examining trends in flow characteristics while varying intensity mixture properties. used study examine morphological changes result from intertwined effects instability, as demonstrated local displacement curvature front, extent wrinkling folding surface, overall brush thickness. also provides direct evaluation turbulent speed its dependence mean strain it experiences. Also discussed various enstrophy scalar gradient production/destruction, degree anisotropy created burned gas, restructuring vortical motion beyond flame.