This paper presents a parametric study on the interaction of twin circular synthetic jets (SJs) that are in line with a crossflow over a flat plate. The resulting vortex structures under different actuation, and flow conditions are investigated using two-plane dye visualization in a water tunnel. The influence of four independent nondimensional parameters, i.e., the Reynolds number (ReL), Strouhal number (St), velocity ratio (VR), and phase difference (Δϕ), on the behavior of the twin SJs is studied. It is found that the increase of Reynolds number causes the SJ-induced vortex structures more turbulent, making the twin SJ interaction less organized. The increase of velocity ratio pushes the occurrence of interaction further away from the wall and makes the resulting vortex structures more sustainable. The St has no obvious influence on the interaction. And three types of vortex structures are observed under different phase differences: one combined vortex, two completely separated vortices, and partially interacting vortex structures. Based on this parametric study, a simple model is proposed to predict the resulting vortex pattern for the twin SJ interaction.
Dye Visualization of In-Line Twin Synthetic Jets in Crossflows—A Parametric Study
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 20, 2016; final manuscript received March 28, 2017; published online June 20, 2017. Assoc. Editor: Peter Vorobieff.
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Wen, X., and Tang, H. (June 20, 2017). "Dye Visualization of In-Line Twin Synthetic Jets in Crossflows—A Parametric Study." ASME. J. Fluids Eng. September 2017; 139(9): 091203. https://doi.org/10.1115/1.4036410
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