A Numerical Study of a Bluff-body Stabilized Diffusion Flame. Part 1. Influence of Turbulence Modeling and Boundary Conditions

This is the first part of a paper on numerical prediction of a bluff-body stabilized turbulent diffusion flame of syngas and air. This part considers the influence of turbulence modeling and boundary conditions on the predictions. Part 2 investigates the effect of the turbulence-chemistry interactio...

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Bibliographic Details
Published in:Combustion science and technology 1996-10, Vol.119 (1-6), p.171-190
Main Authors: GRAN, INGE R., MAGNUSSEN, BJØRN F.
Format: Article
Language:English
Subjects:
Applied sciences
bluff-body
boundary conditions
Combustion of gaseous fuels
Combustion. Flame
Diffusion flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
recirculation
Theoretical studies. Data and constants. Metering
turbulence models
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Summary:This is the first part of a paper on numerical prediction of a bluff-body stabilized turbulent diffusion flame of syngas and air. This part considers the influence of turbulence modeling and boundary conditions on the predictions. Part 2 investigates the effect of the turbulence-chemistry interaction model and the effect of finite-rate chemistry. Results based on the "standard" k-s model and a Reynolds-stress-equation (RSE) model are compared. Measurements are taken from the literature. The RSE model predicts results in better agreement with the measurements than the k-e model. The two models predict significantly different composition and temperature levels in the recirculation bubble created by the bluff body. The specification of the turbulence level in the fuel-jet has a substantial influence on the axial decay of mixture fraction. Grid-resolution studies show that a relatively coarse grid is capable of representing the present flow with sufficient accuracy to evaluate the various sub-models.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102209608951998