Abstract
Velocity vectors and concentration profiles of a coaxial swirling jet have been measured using flow visualization and image processing. It has been found that for X/D<2, where D is nozzle diameter and X is distance from the nozzle, an inner nonswirling jet and an outer swirling jet flow separately with a slight inclination caused by the cross flow, but for X/D>2 they rapidly mix with each other and start to incline. The diffusion width of a coaxial jet is nearly equal to that of a simple jet, but the inclination of a coaxial jet is smaller. These results can be applied to the design of burners or air ports in utility boiler furnaces.
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