The ability to impart momentum while maintaining a zero net mass flux renders synthetic jet actuators attractive tools for a wide variety of applications. Implementation of a single synthetic jet actuator for large-scale operations is unrealistic and, as such, an array of actuators is usually desired during flow control processes. The added complexity of several synthetic jets in close proximity and the subsequent jet-jet interaction, in addition to interaction with the cross flow, represent an area of research yet to be fully explored. This paper encompasses a parametric study to investigate the interaction of a zero pressure gradient turbulent boundary layer (${\text{Re}}_{\tau }=1300$) with twin parallel synthetic jets, where the major axis of the rectangular orifices is aligned with the cross flow. Only the separation distance, $s$, and the phase difference, $\beta$, between the two orifices are varied. Geometrical parameters such as the orifice shape and aspect ratio ($\text{AR}=13$), as well as fluidic properties such as the jet Strouhal number ($\text{St}=2.3$) and the momentum coefficient ($C_{\mu }=0.16$) are kept constant throughout. Velocity fields acquired through stereoscopic particle image velocimetry (SPIV) measurements at five downstream locations indicate noticeable differences in the flow field and associated stresses. A limit in spacing is noted beyond which any subsequent increase results in the twin jets behaving as two independent synthetic jets. In comparison to a single synthetic jet in cross flow, the results demonstrate that twin jets operate at a specific phase difference and spacing can be equally, if not, more efficient for flow entrainment and momentum distribution.

中文翻译：

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湍流边界层中平行矩形双射流的相互作用和矢量化

在保持零净质量通量的同时传递动量的能力使合成射流执行器成为广泛应用的有吸引力的工具。用于大规模操作的单个合成射流致动器的实现是不现实的，因此，通常在流量控制过程中需要一系列致动器。除了与错流的相互作用外，几个紧密相邻的合成射流的增加的复杂性以及随后的射流与射流的相互作用代表了尚待充分探索的研究领域。本文包含一项参数研究，以研究零压力梯度湍流边界层（${\text{关于}}_{\tau }=1300$）与双平行的合成射流，其中矩形孔的主轴线与错流对齐。只有间隔距离，$s$，以及相位差， $\beta$，两个孔之间是不同的。几何参数，例如孔口形状和长宽比（$\text{增强现实}=13$）以及射流Strouhal数（$\text{英石}=2.3$）和动量系数（$C_{\mu }=0.16$）始终保持不变。通过立体粒子图像测速（SPIV）测量在五个下游位置获得的速度场表明流场和相关应力存在明显差异。注意到间距上的限制，超过该间距，任何随后的增加都会导致双喷口表现为两个独立的合成喷口。与横流中的单个合成射流相比，结果表明，双射流在特定的相位差下运行，并且间距（如果不是这样的话）对于引流和动量分布同样有效（如果不是）。