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Study of Streamwise-Vorticity-Stirred Combustion.
UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CT
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Experiments were conducted to establish the effects of the introduction of streamwise vorticity in combusting flows modelling those developed within small gas turbine engines. The objective of the effort was to determine whether this combustion concept has the potential for improving the volumetric heat release rates that characterize these engines. Water flow- visualization tests were performed to evolve lobed mixer configurations that, while generating vortex arrays within both the primary and secondary streams, would also provide rapid intermixing between the streams. These experiments resulted in the definition of enhanced-mixing configurations that were characterized, according to air bubble and dye trajectories, by strong interactions between the two streams. These interactions induced a substantial vertical interchange of primary and secondary fluids. Intermingling of the two fluids occurred throughout a region covering 80 percent of the height of the duct within distances from the lobe mixer trailing edge ranging from approximately one-half to one duct height.
APPROVED FOR PUBLIC RELEASE