Vortex dynamics of in-line twin synthetic jets in a laminar boundary layer
Vortex dynamics of in-line twin synthetic jets in a laminar boundary layer
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DOI：
10.1063/1.4928216
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发表时间：
2015-08
影响因子：
4.6
通讯作者：
X. Wen;Hui Tang;F. Duan
中科院分区：
文献类型：
--
作者：
X. Wen;Hui Tang;F. Duan
实验研究了双合成射流在平板层流边界层上引起的涡。在四个不同的相位差（Δϕ = 0°，90°，180°和270°）下工作的双SJs使用立体彩色染料可视化系统进行可视化，并使用二维粒子图像测速（PIV）系统进行测量。研究发现，根据双SJs的相位差，可以产生三种不同类型的涡结构。在Δϕ = 90°处，两个发夹涡在涡旋大小、强度和速度方面以一种非常有建设性的方式相互作用，形成一个组合涡旋。在Δϕ = 270°处，两个单独的发夹涡没有太多的相互作用，形成了两个完全分离的发夹涡，其行为就像单个SJ情况的频率加倍。在Δϕ = 0°和180°处，双SJ致动器产生的两个发夹涡足够接近，其中一个发夹涡的头部与另一个发夹涡的腿耦合在一起。
An experimental investigation is conducted on the vortices induced by twin synthetic jets (SJs) in line with a laminar boundary layer flow over a flat plate. The twin SJs operating at four different phase differences, i.e., Δϕ = 0°, 90°, 180°, and 270°, are visualized using a stereoscopic color dye visualization system and measured using a two-dimensional particle image velocimetry (PIV) system. It is found that depending on the phase difference of twin SJs, three types of vortex structures are produced. At Δϕ = 90°, the two hairpin vortices interact in a very constructive way in terms of the vortex size, strength, and celerity, forming one combined vortex. At Δϕ = 270°, the two individual hairpin vortices do not have much interaction, forming two completely separated hairpin vortices that behave like doubling the frequency of the single SJ case. At Δϕ = 0° and 180°, the two hairpin vortices produced by the twin SJ actuators are close enough, with the head of one hairpin vortex coupled with the legs of th...