We present a simple method to generate discrete aerodynamic gust under controlled laboratory condition in the form of a vortex ring which, unlike conventional methods of perturbation, is well studied and highly controllable. We characterized the flow properties of the vortex ring using flow visualization and novel light bead method. Reynolds number of the vortex ring, based on its average propagation velocity and nozzle exit diameter, was 16000. We demonstrate this method by studying the impact of head-on gust on freely flying soldier flies, Reynolds number of which, based on its wingtip velocity and mean wing chord, was 1100. We also present simple theoretical models to characterize the vortex ring based on generating conditions. The device can also be used to generate continuous gust in any direction and can be applied, in general, to study the gust response of natural fliers and swimmers, man-made micro aerial vehicles and aquatic plant lives.

中文翻译：

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涡流环发生器的设计与开发，用于研究环阵阵风的影响

我们提出了一种简单的方法，可在受控的实验室条件下以涡流环的形式产生离散的空气动力学阵风，该涡流环与传统的扰动方法不同，是经过充分研究和高度可控的。我们使用流动可视化和新颖的光珠方法表征了涡流环的流动特性。根据涡旋环的平均传播速度和喷嘴出口直径，其雷诺数为16000。我们通过研究迎头阵风对自由飞行的士兵苍蝇的影响，证明了该方法，其中雷诺数基于翼尖速度平均翼弦为1100。我们还提出了简单的理论模型，以根据生成条件来表征旋涡环。该设备还可以用于在任何方向产生连续阵风，并且通常可以应用于