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Fourth International Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

SIMULATION AND MEASUREMENT OF FLOW PHENOMENA IN A COAXIAL JET MIXER

pages 723-728
DOI: 10.1615/TSFP4.1210
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RÉSUMÉ

Flow phenomena in a coaxial jet mixer are studied using numerical (LES) and experimental (LIF) methods. Measurements of distributions of a passive scalar (Rhodamin 6G) in mixer cross-sect ions at different distances from the nozzle have been carried out by Laser Induced Fluorescence (LIF) method. Distributions of the time averaged mixture fraction and its auto corellation functions across the mixer sections are presented. Calculations have been done with Large Eddy Simulation using an inflow generator and a clipping procedure proposed by the authors. The vortex structures are identified from the analysis based on the λ2 criterion. Results for time averaged mixture fraction are compared with numerical results obtained by several LES and RANS models for the flow regime with the recirculation zone. The analysis revealed advantages of the dynamical mixed SGS model (DMM) compared with other models. Influence of different parameters of the flow on mixing is investigated.

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