Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Numerical investigation of an isothermal swirling flow
Submission Author:
Everton Ribeiro , PR
Co-Authors:
Everton Ribeiro, Ricardo Salvo, Rodrigo Corrêa da Silva, Rafael Sene de Lima, Ismael Marchi Neto
Presenter: Everton Ribeiro
doi://10.26678/ABCM.COBEM2019.COB2019-0723
Abstract
Numerical simulations of an isothermal swirling flow generated by a burner was carried employing OpenFOAM. The geometry, operating conditions and velocity measurements of the combustion chamber were reported in literature. The numerical results were obtained by applying Large Eddy Simulation (LES) -Smagorinsk approach and compared with experimental results obtained employing the volumetric three-components velocimetry (V3V) technique. 3D-geometry consisted of hexahedral mesh and included the swirler located within the burner. Large scale structures were identified applying Q-criterion as well as pressure and velocity isosurfaces. Comparisons of numerical and experimental data indicated LES approach was able to predict the flow envelope and peak velocities. A large and central inner recirculation zone in the vicinity of burner was generated due to both swirling effect and burner geometry. In opposite to the experimental data, numerical results showed a symmetrical flow, possibly as a result of either boundary conditions or geometry simplification. Nevertheless, radial profiles of axial and tangential velocities indicated large gradients were reasonably well captured by the simulations. Other parameters such as width of internal recirculation zone, minimum axial velocity and mass flow recirculation indicated simulations reproduced the flow with satisfactory accuracy.
Keywords
Swirling Flow, Large Eddy Simulation (LES), OpenFOAM, Large scale structure
