An experimental study of the flow stabilization in a channel with a swirled periphery jet

This paper represents results of experimental study on the coaxial flow mix ing in channels with a swirled periphery jet. These experiments were carrie d out in the long cylindrical tubes and in the vortex chambers with a diaph ragmed exit. The main attention was paid to the parameter distribution in t he near-axial region of the flow depending on the entrance geometry and flo w rate characteristics. The effects of the swirl angle of the periphery jet , a thickness of the edge between coaxial flows, and the concurrency parame ter m = rho(s)w(s)/rho(0)w(0) on the flow stabilization within the field of centrifugal mass forces were analyzed. A character of stabilizing effect o f the flows on the mixing processes was determined by a gas temperature cha nge along the channel's axis and turbulence intensity. Generalizing depende ncies were obtained for a relative temperature at the axis both in the swir led and direct flows. Experimental results on the heat flow mixing in vorte x chambers are shown here. There are some similarities for transfer process es in the vortex chambers and long tubes. The main difference is that the d iaphragmed chamber and boundary layers at the edge walls considerably effec t the mixing. (C) 1999 Elsevier Science Ltd. All rights reserved.