S8  Engenharia Aeroespacial    Titulo: NUMERICAL ANALYSIS OF COAXIAL TURBULENT JETS IN DIFFUSERS AND CONTRACTIONS   Resumo : 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     Autores : Braga, Edimilson J. de Lemos, Marcelo J. S.     Trabalho Completo :   COBEM99 | Comissão  Organizadora | Palestras | Sessões Técnicas | Autor | Simpósios e Sessões Especiais | Revisores |  Título  dos  Trabalhos | Local