The work presents comparisons of the flame stabilization characteristics of axisymmetric disk and 2D slender bluff-body burner\r\nconfigurations, operating with inlet mixture stratification, under ultralean conditions.Adouble cavity propane air premixer formed\r\nalong three concentric disks, supplied with a radial equivalence ratio gradient the afterbody disk recirculation, where the first flame\r\nconfiguration is stabilized. Planar fuel injection along the center plane of the leading face of a slender square cylinder against the\r\napproach cross-flow results in a stratified flame configuration stabilized alongside the wake formation region in the second setup.\r\nMeasurements of velocities, temperatures, OH* and CH* chemiluminescence, local extinction criteria, and large-eddy simulations\r\nare employed to examine a range of ultralean and close to extinction flameconditions.Thevariations of the reacting front disposition\r\nwithin these diverse reacting wake topologies, the effect of the successive suppression of heat release on the near flame region\r\ncharacteristics, and the reemergence of large-scale vortical activity on approach to lean blowoff (LBO) are investigated. The crosscorrelation\r\nof the performance of these two popular flame holders that are at the opposite ends of current applications might\r\noffer helpful insights into more effective control measures for expanding the operational margin of a wider range of stabilization\r\nconfigurations.
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