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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

CONTROL OF COAXIAL JETS BY AN AZIMUTHAL EXCITATION: VORTEX DYNAMIC AND MIXING PROPERTIES

pages 899-904
DOI: 10.1615/TSFP5.1410
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RÉSUMÉ

The goal of this work is to improve the mixing properties of a coaxial jet with moderate Reynolds number by active control. Two direct numerical simulations of coaxial jets are performed. First, studying a "natural" (without deterministic control) coaxial jet, we show that the appearance of counter-rotating pairs of streamwise vortices allows ejections from the seeding regions. This initiates the turbulent mixing. However spots of unmixed fluids persist at the end of the computational domain. We use then deterministic perturbation to allow an improvement of the mixing properties of the jet. The deterministic perturbation has an azimuthal part which forces the appearance of pairs of streamwise vortices. Finally, we found a real improvement of the mixing properties with a good homogeneity at the end of the computational domain due to a quicker appearance of small scales.

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