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- W343668183 abstract "Flame-diagnostic measurements were made on practical burner flames and on idealized bluff-body burner flames to identify flame characteristics to be used in improving burner designs. For the practical burner, flame-visualization studies were made with direct photography, short-exposure schlieren and high-speed schlieren movies for radial, coaxial, and bluff-fuel injector configurations with and without divergent quarls and combustion-air swirl. The coaxial and radial injector flames were stabilized away from the burner face and had small-scale inner flow structures on large-scale outer structures. The bluff-body flame was stabilized by the recirculation zone and showed smaller substructures in the non-jet region. For the idealized bluff-body burner, visualization was made by photographs of light scattered from laser-illuminated alumina seed particles, and concentration profiles were obtained with Raman scattering and laser-induced fluorescence. Flame visualization showed a wide variety of flame types resulting from varying air and fuel flow. With low air flow, flames were stabilized at the burner face by 3-D vortices. At high air flow, flames were stabilized by a stagnation zone on the burner axis. Both flames showed large-scale intermittent structures. Laser-concentration imaging was very effective in revealing flame initiation and propagation. At low air flow, flames propagate by periodic bursts of near burnermore » vortices. At high air flow, diffusion flames are established in the vicinity of the stagnation zone.« less" @default.
- W343668183 created "2016-06-24" @default.
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- W343668183 date "1986-06-01" @default.
- W343668183 modified "2023-09-27" @default.
- W343668183 title "Turbulent-flame characterization for improved gas-burner performance. Final report, November 1983-June 1986" @default.
- W343668183 hasPublicationYear "1986" @default.
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