Topology of turbulent premixed and stratified LPG/air flames

Premixed and stratified Liquefied Petroleum Gas (LPG)/air flames realized on a bluff body swirl-stabilized burner are studied in confined environment. A laboratory-scale is designed such way that it can independently investigate the effects of mixture stratification, swirl number, direction, Reynolds number broad range test conditions. total 80 different cases investigated, with four combinations, two direction velocity ratios, five stratification ratios. The flame topology investigated using simultaneous acquisition hydroxyl radical (OH*) methylidyne (CH*) chemiluminescence direct imaging. series premixed topologies compared mean Abel-deconvoluted images images. appear to be lifted V-flames influenced primarily by combinations rather than or ratio variations. For same swirler more compact flames, higher similar shape. counter-rotating coaxial arrangement less likely affect structure change number. According study, outer angle determines shape, whereas inner influences mixing, which aids stabilization.