Dye visualization of in-line twin synthetic jets in crossflows - A parametric study

[+] Author and Article Information
Xin Wen

School of Mechanical Engineering Shanghai Jiao Tong University, Shanghai, 200240, China

Hui Tang

Department of Mechanical Engineering The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China

1Corresponding author.

ASME doi:10.1115/1.4036410 History: Received February 20, 2016; Revised March 28, 2017


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 differ- ent actuation and flow conditions are investigated using stereoscopic color dye visualization in a water tunnel. The influence of four independent non-dimensional parameters, i.e., the Reynolds number ReL, Strouhal number St, velocity ratio V R, and phase difference ?f, 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 Strouhal number 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.

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