Turbulent-flame characterization for improved gas-burner performance. Final report, November 1983-June 1986

Technical Report · Sun Jun 01 00:00:00 EDT 1986

OSTI ID:5694720

Kelly, J; Namazian, M

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 burner vortices. At high air flow, diffusion flames are established in the vicinity of the stagnation zone.

• Research Organization: Acurex Corp., Mountain View, CA (USA)
• OSTI ID: 5694720
• Report Number(s): PB-88-112479/XAB; ACUREX-FR-86-105-ESD
• Resource Relation: Other Information: See also PB--85-180495
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
GAS BURNERS
FLAME PROPAGATION
PERFORMANCE
COMBUSTION
FLOW VISUALIZATION
STABILITY
TURBULENT FLOW
BURNERS
CHEMICAL REACTIONS
FLUID FLOW
OXIDATION
THERMOCHEMICAL PROCESSES
034000* - Natural Gas- Combustion
320106 - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)