A series of experiments involving the particle image velocimetry technique are carried out to analyse the quantitative effectiveness of the synthesized vortical structures towards actual flow separation control. The streamwise vortices are synthesized from the synthetic jet actuator and introduced into the attached and separating boundary layer developed on the flat plate surface. Two types of actuators with different geometrical set-ups are used to analyse the evolution of vortical structures in the near wall region and their impact towards achieving separation delay in the boundary layer. First, a single circular jet is synthesized by varying actuator operating parameters and issued into the boundary layer to evaluate the dynamics of the interaction between the vortical structures and the near wall low momentum fluid in the separated region. Second, an array of jets has been issued into the artificially separated region to assess the effectiveness of various vortical structures towards achieving the reattachment of the separated flow in the streamwise direction.Graphical abstract

中文翻译：

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由诱导涡引起的边界层中的流动分离延迟

进行了一系列涉及粒子图像测速技术的实验，以分析合成涡流结构对实际流动分离控制的定量有效性。流向涡流由合成射流致动器合成，并引入在平板表面上形成的附着和分离边界层。使用具有不同几何设置的两种类型的执行器来分析近壁区域涡结构的演变及其对实现边界层分离延迟的影响。首先，通过改变执行器操作参数合成单个圆形射流并发出到边界层，以评估分离区域中涡流结构与近壁低动量流体之间相互作用的动力学。