Study of Streamwise Vorticity-Stirred Combustion
Final rept. 1 Sep 1989-30 Nov 1993
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. 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. Combustion experiments were carried out in a high-pressure 7 atm combustion apparatus. Direct observation and gas sampling were employed to characterize the fuel-air ratio distribution effected by the mixers. Flame geometries were compared with those developed during shear-layer combustion occurring downstream from a conventional splitter plate. As contrasted with the 5- to 7-degree flame front angles that occurred during shear layer combustion, the flame front angles developed during combustion using the lobed mixers were more than twice as great, attaining levels approaching 20 degrees.
- Fluid Mechanics