Effect of equivalence ratio and approach flow turbulence properties on the internal structure of premixed rod-stabilized flames

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(87)90001-0· OSTI ID:6508428

Rajan, S

Utilizing an instantaneous Rayleigh scattering technique, experiments were conducted to evaluate the separate influences of fuel-air ratio and approach flow turbulence properties on the internal structure of turbulent premixed V-shaped flames stabilized at the exit plane of a square burner. It is shown that an increase in the approach flow turbulent fluctuation velocities tends to reduce the instantaneous flame thickness. The spatial structure of the flame as described by the strength of the density fluctuations is found to be influenced by both equivalence ratio and turbulence intensity. Comparison of density fluctuation intensities with predictions from the Bray-Moss-Libby model indicates that the nature of the assumed pdf for closure of the governing equations can be influenced by both mixture stoichiometry and the properties of the approach flow turbulence.

• Research Organization: Dept. of Mechanical Engineering and Energy Processes, Southern Illinois Univ., Carbondale, IL 62901
• OSTI ID: 6508428
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 68:3; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
BURNERS
COHERENT SCATTERING
DENSITY
DIMENSIONS
DISTRIBUTION
EQUATIONS
EQUIVALENCE PRINCIPLE
FLAME PROPAGATION
FLAMES
FLOW RATE
FLUCTUATIONS
FUEL-AIR RATIO
MATHEMATICAL MODELS
PHYSICAL PROPERTIES
RAYLEIGH SCATTERING
RESEARCH PROGRAMS
SCATTERING
SPATIAL DISTRIBUTION
STABILIZATION
STOICHIOMETRY
THICKNESS
TURBULENCE
VARIATIONS