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首页> 外文期刊>The Aeronautical Journal >Dye visualisation of inclined and skewed synthetic jets in a cross flow
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Dye visualisation of inclined and skewed synthetic jets in a cross flow

机译：交叉流中倾斜和偏斜合成喷嘴的染料可视化

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Dye visualisation of both inclined synthetic jets and skewed synthetic jets was undertaken in a cross-flow experiment and the results were compared with those of normal synthetic jets. The process of vortex roll-up near the orifice exit and how the structure develops and interacts with the cross-flow as it propagates downstream was investigated so as to obtain an understanding of the effect of orifice orientation on the behaviour of synthetic jets. The effects of varying Reynolds number, velocity ratio and Strouhal number due to changes in diaphragm displacements and freestream velocities on the characteristics of synthetic jets were also examined. It is observed that in comparison to the normal jets vortical structures produced by both inclined and skewed jets tend to stay closer to the near wall region where maximum flow control effect is required. In both cases, at a relatively low Reynolds number and velocity ratio the active structures produced by the synthetic jet appear to be hairpin vortices which turn into vortex rings that migrate away from the wall as the Reynolds number and velocity ratio increase. These hairpin vortices are persistent in the near wall region hence are believed to be desirable structures for delaying flow separation.
机译：在交叉流实验中对倾斜的合成喷嘴和偏斜的合成喷嘴进行了染料可视化，并将结果与​​普通合成喷嘴的结果进行了比较。研究了孔口出口附近的涡旋卷起过程，以及结构如何发展并与错流向下游传播时相互作用，从而了解了孔口取向对合成射流性能的影响。还研究了由于膜片位移和自由流速度的变化而引起的雷诺数，速度比和斯特劳哈尔数变化对合成射流特性的影响。观察到，与正常射流相比，由倾斜射流和偏斜射流产生的涡旋结构倾向于保持更靠近需要最大流量控制效果的近壁区域。在这两种情况下，在相对较低的雷诺数和速度比下，由合成射流产生的活性结构似乎是发夹旋涡，随着雷诺数和速度比的增加，该发夹旋涡变成旋涡环，该旋涡环从壁上移走。这些发夹状涡流在近壁区域中持久存在，因此被认为是延迟流动分离的理想结构。

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