Abstract
The spatial and temporal characteristics of dynamic states of premixed flames on an annular burner are found to be significantly different from the characteristics of the dynamic states observed on a circular burner. At increasingly larger values of a control parameter of heavy hydrocarbon-oxygen mixtures, the steady, uniform, annular front is replaced by a sequence of time-dependent states in which bright spots, highly localized regions of optical emission, move rapidly around the annulus. These particle-like objects appear spontaneously, individually, or in counterpropagating pairs, move in either direction, collide, and annihilate. A high speed camera equipped with a microchannel plate image intensifier is used to record this $>35$ Hz motion. Video sequences of these states are embedded in this presentation in order to demonstrate how the nonperiodic nature of this dynamics evolves at increasing values of the driving parameter. Our results are compared with the findings of numerical studies by Bayliss and Matkowsky on solid fuel combustion in an annular geometry.
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