The effects of swirl direction on the structure of two different premixed flames are investigated in a double concentric premixed swirl burner. The flames were stabilized with two annular jets and a central pipe. Mean and fluctuating temperatures, thermal integral and micro time scales and direct flame photographs were taken to receive information about global flame structures, flame stability and the distribution of the thermal field in these flames. Direct flame photographs, compensatedtemperature data as well as thermal micro-time scales of temperature data are presented to give a complete insight in the thermal distribution in these flames.It was found that the swirl direction of the stabilizing annular jets seems to take great influence on flame symmetry. The flame with the counter-swirling jets showed a very unsymmetrical behavior which was confirmed in flame photographs, temperature maps and time scales.
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