Flow features of confined swirling jets
Journal Title: International Journal of Automotive Engineering and Technologies - Year 2015, Vol 4, Issue 1
Abstract
Assessment of LES models of confined coaxial swirling jets is the aim of this paper. Despite the simple geometrical set-up of the benchmark, the flow pattern shows complex aerodynamic behavior. The case considers two coaxial jets: one axial and another annular swirling jet. The expansion when entering the chamber will produce the Outer Recirculation Zone (ORZ). If swirl number is large enough, an Inner Recirculation Zone (IRZ) is formed. The region between both recirculation zones with high shear is where mixture occurs. Post-process in space and frequency domain supplies useful information of this benchmark. Kernel cores are identified based on the lambda2 parameter. The mesh must be fine enough to capture the inertial regime of the turbulent energy spectrum. Proper Orthogonal Decomposition let identify main flow structures. To sum up, LES models provide more information than conventional RANS models and it is a step forward in any research team to gain an insight of any transitional or fully turbulent process.
Authors and Affiliations
Teresa Parra*| Department of Energy and Fluid Mechanics, University of Valladolid, Spain, Ruben Perez| Department of Energy and Fluid Mechanics, University of Valladolid, Spain, Ville Vuorinen| Dept. of Energy Technology, Aalto University School of Science and Technology, Espoo, Finland, Miguel-Angel Rodriguez| Department of Energy and Fluid Mechanics, University of Valladolid, Spain, Francisco Castro| Department of Energy and Fluid Mechanics, University of Valladolid, Spain
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