Near blowoff dynamics of lean premixed flames stabilized on a meso scale bluff body
Bluff body flame stabilization serves as a canonical configuration to investigate the characteristics of flame stability in many practical combustion devices. As a well defined model problem, bluff body stabilized flames in meso scale channels are investigated using high fidelity simulations with full temporal and spatial resolution. Direct numerical simulations were conducted to investigate the fundamental mechanisms of lean premixed flames stabilized by a bluff body in a channel. Non reacting flow simulations of hydrogen/air mixture were conducted to identify a weak confinement condition. Reacting flow simulations of both hydrogen/air and syngas/air mixture were conducted to observe near blowoff flame dynamics as mean inflow velocity approaches the blowoff limit. Detailed temporal evolution as the flame approaches the blow off limit is examined by the analyzing the instantaneous solution fields.