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LARGE EDDY SIMULATION OF AN ANNULAR SWIRLING JET WITH PULSATING INFLOW

Manuel Garcia-Villalba
SFB 606, University of Karlsruhe, 76128 Karlsruhe, Germany; Bioingenieria e Ingenieria Aeroespacial Universidad Carlos III de Madrid Leganés 28911, Spain

Jochen Frohlich
Institute for Technical Chemistry und Polymer Chemistry University of Karlsruhe; Institute of Fluid Mechanics, Dresden University of Technology, George-Bähr-Str. 3c, D-01062, Germany

Wolfgang Rodi
Institute for Hydromechanics,University of Karlsruhe, D-76128 Karlsruhe, Germany

Abstract

The effect of oscillating inflow on an annular swirling jet is studied by means of large eddy simulation and the results obtained are compared to the same configuration with constant inflow. To assess the influence of the swirl generation method used in applications, two extreme cases are considered, one with pulsating axial and tangential velocity component, one with pulsating axial component only. In both cases the phase-averaged flow features vortex rings. When the phase-averaged flow is removed, instantaneous coherent structures are observed which resemble those of the non-pulsating case. Their coherence is higher when only the axial component oscillates. Analysis of phase-averaged velocity components, vorticity, turbulent kinetic energy and spectra provides detailed information about the flows considered.