Vortical structures in a 2-D bluff-body burner have been studied both experimentally and numerically. In the experiments the dynamics of vortex shedding under isothermal and combusting flow conditions were examined using a 2-D sheet-lighting technique coupled with a chemically reacting system. For the numerical simulations, a set of 2-D unsteady conservation equations were solved in the domain using an ALE (Arbitrary Lagrangian-Eulerian) grid system. For the isothermal experiments the flow rates of the central slot jet were varied, and four different types of vortical structures separated by regions of stability were observed. In the combusting experiments conducted at a fixed outer air flow rate, three regimes were identified based upon whether the central fuel jet penetrates the recirculating flow structures. Results from both experiments and simulations are presented in the form of streakline patterns for various flow conditions.
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