Abstract
The internal aerodynamics of an isothermal laboratory model of a modified four-vortex furnace for a pulverized coal boiler have been experimentally studied. The digital tracer imaging (particle image velocimetry) technique was used to determine average flow velocity distributions and streamline projections in several sections of the model in various regimes of furnace operation determined by the velocity ratio of flows supplied via primary (main) and secondary nozzles. Conditions for the formation of a stable flow structure with four symmetric conjugated vortices in the entire volume of the furnace, as well as the domain of parameters leading to a nonregular spatial vortex structure, were determined.
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