Abstract
Flame structure and geometry of natural gas andpropanediffusion ames in cross ow are presented to delineate the effects of buoyancyand ambientpressure. The fuel was injected horizontally into a verticallymovingairstream. The buoyancy acted along the direction of the cross ow. The combustion-chamber pressure was varied from 1 to 1.45 bar and the cross ow to jet velocity ratio from 0.1 to 1.45. Quantitative rainbow schlieren de ectometry was used to visualize the ame and to measure the geometrical parameters. The centerline ame trajectory showed three distinct regions, and the dimensionless coordinate of the jet centerline in the jet direction varied with 0.45, 0.25, 0 power of the coordinate in the cross ow direction and i 0.5 power of the Froude number based on the jet velocity in these regions. The ame trajectories did not change signi cantly with pressure. Flame chord length varied with 0.45 power of the cross ow/jet velocity ratio. Flame length and soot formation characteristics changed notably with pressure. Propane ames were more susceptible than natural gas ames to the ambient pressure. The ame luminosity caused by soot in the propane ame changed only slightly with velocity ratio. However, the natural gas ame became nonsooty at high velocity ratios.
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