Produção Nacional
Revisado por pares
Numerical simulation of a radial diffuser turbulent airflow
2006; Elsevier BV; Volume: 189; Issue: 2 Linguagem: Inglês
10.1016/j.amc.2006.12.029
ISSN1873-5649
AutoresAlysson Kennerly Colaciti, Luis Miguel Valdés López, Hélio Aparecido Navarro, Luben Cabezas‐Gómez,
Tópico(s)Wind and Air Flow Studies
ResumoIn the present work are presented results from numerical simulations performed with the ANSYS-CFX® code. We have studied a radial diffuser flow case, which is the main academic problem used to study the flow behavior on flat plate valves. The radial flow inside the diffuser has important behavior such as the turbulence decay downstream and recirculation regions inside the valve flow channel due to boundary layer detachment. These flow structures are present in compressor reed valve configurations, influencing to a greater extent the compressor efficiency. The main target of the present paper was finding the simulation set-up (computational domain, boundary conditions and turbulence model) that better fits with experimental data published by Tabatabai and Pollard. The local flow turbulence and velocity profiles were investigated using four different turbulence models, two different boundary conditions set-up, two different computational domains and three different flow conditions (Rein – Reynolds number at the diffuser inlet). We used the Reynolds stress (BSL); the k–ε; the RNG k–ε; and the shear stress transport (SST) k–ω turbulence models. The performed analysis and comparison of the computational results with experimental data show that the choice of the turbulence model, as well as the choice of the other computational conditions, plays an important role in the results physical quality and accuracy.
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