Blowout limits of turbulent jet diffusion flames for arbitrary source conditions

A formulation for the blowout limits of turbulent jet diffusion flames issuing from sources with arbitrary geometries and exit conditions into otherwise quiescent environments is presented. It is argued that, while the lift-off characteristics of turbulent diffusion flames appear likely to be contro...

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Bibliographic Details
Published in:AIAA journal 1990-07, Vol.28 (7), p.1157-1162
Main Authors: Dahm, Werner J. A, Mayman, Avrum G
Format: Article
Language:English
Subjects:
Applied sciences
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION KINETICS
Combustion of gaseous fuels
Combustion. Flame
diffusion
Energy
Energy. Thermal use of fuels
Exact sciences and technology
FLAMES
FLUID FLOW
INHIBITION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
JETS
KINETICS
MIXING
OXIDATION
REACTION KINETICS
STABILITY
Theoretical studies. Data and constants. Metering
THERMOCHEMICAL PROCESSES 400800 > Combustion, Pyrolysis, & High-Temperature Chemistry
turbulence
TURBULENT FLOW
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Summary:A formulation for the blowout limits of turbulent jet diffusion flames issuing from sources with arbitrary geometries and exit conditions into otherwise quiescent environments is presented. It is argued that, while the lift-off characteristics of turbulent diffusion flames appear likely to be controlled by the straining out of flame sheets, the molecular mixing rate at the flame tip controls their blowout characteristics. The concept of a 'far-field equivalent source' is introduced, and the local molecular mixing rate in the flow is expressed in terms of the associated far-field scaling laws. Blowout is expected when a resulting algebraic expression reaches a critical value. Results of a 'flip' experiment verify the far- field equivalent source formulation. Measurements of the blowout limits over a range of geometries, fuels, and diluents show good agreement with the predictions from this formulation. (Author)
ISSN:0001-1452
1533-385X
DOI:10.2514/3.25186