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A Numerical Study of the Bifurcation of Rectangular Synthetic Jets

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Document pages: 4 pages

Abstract: The present paper explores the mechanism of vortex formation and its bifurcation process for a rectangular orifice synthetic jet. The orifice aspect ratio is equal to two (7 x 14 mm2) with hydraulic diameter 9.33 mm and 3 mm thickness. A 3-D numerical simulation using Large-eddy -simulation (LES) model on Fluent software is performed to investigate the vortex formation and its bifurcation process. The diaphragm oscillates at amplitude of 1.6 mm and 2.6mm compromising a volumetric ejection of 1500mm3 and 2500mm3 respectively through orifice at 1 Hz of actuation frequency. The geometry of the cavity and the diaphragm displacement profile as well as the volumetric ejection is kept identical in both the experimental study and the numerical simulations. It has been observed that vortex ring bifurcates in both the cases and the simulation results are in good agreement with the experimental observations. In both the bifurcation cases, the vortex ring undergoes axial switching followed by bifurcation in the minor axis plane. Further the bifurcated rings moves at away from each other in the same plane at different divergence angle depending on the vortex ejection velocity during forward stroke of the diaphragm and its actuation frequency.

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