Abstract
Abstract In the swirl-stabilized flame studied, the heat release and the swirl were systematically varied in order to quantify their effects on the internal recirculation zone, the mixing, the velocity PDFs and the flame blowoff limits. The amount of heat release was varied by changing the overall equivalence ratio, and the swirl number was varied up to 4.0 to assess the advantages or disadvantages of very high swirl operation. The velocity fields in nine non-premixed flames and three cold flows were mapped out using laser velocimetry. It was found that increasing the heat release resulted in a number of benefits, including an increase in the recirculation, the turbulence levels, and the flame stability. Heat release helped to drive the recirculation, since in some cases the cold flow did not have recirculation but the corresponding flames did. Turbulent kinetic energy levels increased by a factor of three as heat release increased. The effect of increasing the swirl was to improve the mixing and flame st...
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