The aerodynamic characteristics of a normal hovering foil with Synthetic Jet (SJ) actuation are numerically studied in this work. An elliptic foil with ratio of 4 undergoes the imposed translation and rotation synchronously. A pair of SJs with the same frequency and strength is placed on the upper and lower surfaces of the foil. Thus, the local flow field around the foil would be influenced. At the Reynolds number of 100 and the rotating axis position of half chord, the effects of the inclined angle between the jet direction and the chord line, the phase angle between the SJs and the translation as well as the SJ location on the aerodynamic characteristics are systematically examined. Compared with the oscillating foil without SJ actuation, it is illustrated that the enhancement of mean lift force and hovering efficiency can be obtained by using the SJs with suitable working parameters. Based on the numerical analysis, it is found that the jet flow on the foil surfaces, which changes the local pressure distribution, can benefit the aerodynamic performance of the hovering foil.

中文翻译：

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具有合成射流驱动的正常悬停翼型的气动特性

在这项工作中数值研究了具有合成射流（SJ）致动的常规悬停箔的空气动力学特性。比率为4的椭圆形箔片会同步进行平移和旋转。将一对具有相同频率和强度的SJ放在箔的上，下表面。因此，将影响箔片周围的局部流场。在雷诺数为100和半弦的旋转轴位置时，射流方向和弦之间的倾斜角，SJ和平移之间的相角以及SJ位置对空气动力学特性的影响是系统地检查。与没有SJ驱动的振荡箔相比，结果表明，通过使用具有合适工作参数的SJ可以提高平均升力和悬停效率。基于数值分析，发现箔表面上的射流会改变局部压力分布，从而有利于悬停箔的空气动力学性能。