Controlled Streamwise Vorticity in Diffuser Boundary Layer using Hybrid Synthetic Jet Actuation
Controlled Streamwise Vorticity in Diffuser Boundary Layer using Hybrid Synthetic Jet Actuation
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DOI：
10.2514/6.2009-4021
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
A. Gissen;B. Vukasinovic;A. Glezer
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文献类型：
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作者：
A. Gissen;B. Vukasinovic;A. Glezer
通过利用表面安装的被动和主动流量控制元件与横流的相互作用，在小型风洞中以高亚音速（最高 M = 0.5）对流向涡度集中的形成进行了实验研究。流向涡流的受控形成是减轻嵌入式推进系统中二次流不利影响的关键因素，该系统具有复杂的入口几何形状，会影响发动机入口面的压力恢复和变形。这些涡流的演变是在沿着测试部分壁之一的会聚-发散插入件上进行研究的，该插入件旨在提供模拟典型偏置扩散器内的压力梯度的逆压力梯度。分别使用传统的被动微斜坡和微叶片形成反向旋转涡流对和单感涡流并对其进行表征。事实证明，使用具有矩形孔口的合成射流致动器也可以实现类似的流向涡流，这些矩形孔口倾斜或偏斜以产生单感涡流，或者流向对齐以产生涡流对。混合驱动通过结合被动和主动驱动方法来证明，以产生具有显着程度可控性的“故障安全”设备。
The formation of streamwise vorticity concentration by exploiting the interaction of surface-mounted passive and active flow control elements with the cross flow is investigated experimentally in a small-scale wind tunnel at high subsonic speeds (up to M = 0.5). Controlled formation of streamwise vortices can be a key element in the mitigation of the adverse effects of secondary flows in embedded propulsion system with complex inlet geometries that can affect pressure recovery and distortion at the engine inlet face. The evolution of these vortices is investigated on a converging-diverging insert along one of the test section walls that is designed to provide an adverse pressure gradient that mimics the pressure gradient within a typical offset diffuser. Counterrotating vortex pairs and single-sense vortices are formed and characterized using conventional passive micro-ramps and micro-vanes, respectively. It is demonstrated that similar streamwise vortices can also be realized using synthetic jet actuators having rectangular orifices that are slanted or skewed to produce single-sense vortices, or streamwise aligned to produce vortex pairs. Hybrid actuation is demonstrated by combining the passive and active actuation approaches to yield a “fail-safe” device with significant degree of controllability.