A fluid dynamics numerical simulation is carried to study the gust characteristics produced downstream of a pair of sinusoidally pitching two-dimensional thin foils with a certain lateral spacing and placed in a freestream flow. The flow was simulated for Reynolds number (Re) = 1.6 × 10⁵, the airfoil pitching angle = 6.9°, and a range of reduced frequencies (0.54 ≤ k ≤ 1.2). Between the two (undulating) wakes of the two foils, the flow is irrotational and unsteady that can be used to study gust response of, for example, micro-air vehicles (MAVS). The maximum gust velocity that can be generated by this technique is, however, limited to (5–7) % of the mean flow velocity. To enhance the gust intensity, a new method is proposed: introduction of a jet at the trailing edge of each pitching foil. Results show that the addition of the trailing jet enhances the gust intensity by 2–7 times for the Re, jet velocity, and the range of reduced frequencies considered. This technique provides a simple, economical, and controlled way to study gust response of MAVs and aircraft in wind tunnels.

进行流体动力学数值模拟以研究在具有一定横向间距并置于自由流中的一对正弦倾斜二维薄箔下游产生的阵风特性。流体模拟雷诺数 (Re) = 1.6 × 10 ⁵，翼型俯仰角 = 6.9°，以及一系列降低的频率 (0.54 ≤ k ≤ 1.2)。在两个箔的两个（起伏）尾流之间，流动是无旋和不稳定的，可用于研究例如微型飞行器 (MAVS) 的阵风响应。但是，该技术可以产生的最大阵风速度限于平均流速的 (5–7) %。为了增强阵风强度，提出了一种新方法：在每个俯仰翼的后缘引入射流。结果表明，对于 Re、射流速度和所考虑的降低频率范围，尾流射流的添加使阵风强度提高了 2-7 倍。该技术提供了一种简单、经济且可控的方法来研究 MAV 和飞机在风洞中的阵风响应。