Preliminary results of a numerical-experimental study of the dynamic structure of a buoyant jet diffusion flame

Preliminary results of a joint numerical-experimental investigation of the dynamic structure of a buoyant jet diffusion flame are presented. The purpose of this effort is to determine the nature of the unsteady interactions between flames and their associated vortex motions. A direct numerical simul...

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Bibliographic Details
Published in:Combustion and flame 1991-02, Vol.83 (3), p.263,IN3,267-266,IN4,270
Main Authors: Davis, R.W., Moore, E.F., Roquemore, W.M., Chen, L.-D., Vilimpoc, V., Goss, L.P.
Format: Article
Language:English
Subjects:
03 NATURAL GAS
034000 - Natural Gas- Combustion
AIR
ALKANES
Applied sciences
CALCULATION METHODS
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
Combustion of gaseous fuels
Combustion. Flame
DIFFUSION
Energy
Energy. Thermal use of fuels
Exact sciences and technology
FLAMES
FLUIDS
GASES
HYDROCARBONS
JETS
KINETICS
ORGANIC COMPOUNDS
PROPANE
REACTION KINETICS
Theoretical studies. Data and constants. Metering
THERMAL DIFFUSION
THERMODYNAMICS
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Summary:Preliminary results of a joint numerical-experimental investigation of the dynamic structure of a buoyant jet diffusion flame are presented. The purpose of this effort is to determine the nature of the unsteady interactions between flames and their associated vortex motions. A direct numerical simulation of an unsteady low-speed propane-air jet diffusion flame is carried out utilizing the flame sheet and conserved variable approximations. Counterrotating vortex structures internal and external to the flame surface appear and move upward along with flame sheet bulges. Tip-cutting (flickering) occurs with a frequency of 11–15 Hz. These dynamic features bear close resemblance to those observed experimentally by means of the reactive Mie scattering (RMS) technique. Comparisons between computational and experimental (determined using thin filament pyrometry) near-instantaneous radial temperature profiles at four heights in the flame also show good agreement. The assumption of zero gravity in the computation results in the complete cessation of dynamical activity, thus demonstrating the important role that buoyancy plays in the behavior of this flame.
ISSN:0010-2180
1556-2921
DOI:10.1016/0010-2180(91)90074-L