Abstract
The paper presents an analysis of extinction and re-ignition by a topological characterization of turbulent flame edges. Typically there exist two types of structures on the stoichiometric mixture-fraction isosurface: flame patches and extinction holes. Physically, flame patches are isolated burning islands on the stoichiometric isosurface surrounded by non-reactive regions; while its counterpart is defined as extinction holes, which are extinguished islands immersed in reactive regions. Based on a newly designed numerical algorithm to connect the fringe points of these segments, a more refined analysis can be performed by grouping them according to their sizes. These two different structures behave significantly different at different mixing and reaction stages during the extinction/re-ignition process. Conditioned on flame patches and extinction holes with respect to their sizes, some important properties have been investigated, such as heat release rate, surface curvature, scalar dissipation rate and flame edge speed. These statistics provide further insights into turbulent combustion and flame modeling.
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