Abstract
Flames advected by swirling flows are subject to large strain rates that may cause local extinction. In this investigation, a porous-disk burner is spun at a constant angular velocity in an otherwise quiescent oxidizing atmosphere. Gaseous methane is injected through the disk pores and burns in a flat diffusion flame adjacent to the disk, resulting in a variety of nonpremixed flame patterns for different combinations of the angular velocity and fuel flow rate. The method of activation-energy asymptotics is employed to address the transition from conditions under which a diffusion flame envelops the entire disk to conditions under which diffusion flames are present over only part of the disk, leading to the presence of edge flames. An expression for the extinction Damköhler number as a function of the fuel flow rate and angular velocity is derived and compared with experiments. Agreement is favorable when parameters for a one-step model of methane combustion are employed.
Published Version
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