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S8 Engenharia Aeroespacial |
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Title:
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NUMERICAL ANALYSIS OF COAXIAL TURBULENT JETS IN DIFFUSERS AND CONTRACTIONS
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Summary :
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ABSTRACT. TURBULENT FLOW FIELD CALCULATIONS FOR CONFINED COAXIAL STREAMS ARE PRESENTED. THE CASES OF TURBULENT FLOW IN A GRADUALLY EXPANDING/CONTRACTING CONICAL DUCT, PRECEDED AND FOLLOWED BY A CONSTANT AREA SECTION, ARE ANALYZED. TURBULENCE IS MODELED BY MEANS OF THE STANDARD K-E MODEL SINCE NO STRONG CURVATURE IS OF CONCERN. A MARCHING-FORWARD NUMERICAL INTEGRATION TECHNIQUE IS USED TO SWEEP THE COMPUTATIONAL DOMAIN. WITHIN CONTRACTIONS, TURBULENCE IS DAMPED, WHEREAS IN EXPANSIONS THE VALUED OF K IS INCREASED. IT WAS ALSO FOUND THAT TURBULENCE KINETIC ENERGY LEVELS ARE GREATER WHEN THE INTERNAL JET IS FASTER THAN THE ANNULAR STREAM.
KEYWORDS: TURBULENT JETS, COAXIAL JETS, DIFFUSERS, CONTRACTIONS. TURBULENCE MODELING
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Author :
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Braga, Edimilson J.
de Lemos, Marcelo J. S.
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Paper View :
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