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research-article

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
wenxin84@sjtu.edu.cn

Hui Tang

Department of Mechanical Engineering The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China
h.tang@polyu.edu.hk

1Corresponding author.

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

Abstract

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.

Copyright (c) 2017 by ASME
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