The ability of dragonflies to fly in the rain without being wetted by raindrops has motivated researchers to investigate the impact behavior of a drop on the superhydrophobic wings of dragonflies. This superhydrophobic surface is used as a reference for the design of directional surfaces and has attracted extensive attention owing to its wide applicability in microfluidics, self-cleaning, and other fields. In this study, the static contact angle and rebound process of a drop impacting a dragonfly wing surface are investigated experimentally, whereas the wetting pressure, Gibbs free energy, and Stokes number vs. coefficient of restitution are theoretically calculated to examine the dynamic and unidirectional transport behaviors of the drop. Results show that the initial inclination angle of the dragonfly wing is similar to the sliding angles along with the drop sliding. The water drop bounces from the bottom of the dragonfly wing to the distal position, demonstrating directional migration. The drop impacts the dragonfly wing surface, and the drop exhibits compression, recovery, and separation phases; in these three phases, the drop morphology evolves. As the Gibbs free energy and cross-sectional area evolve, the coefficient of restitution decreases as the drop continues to bounce, and the Stokes number increases.

蜻蜓在雨中飞行而不被雨滴弄湿的能力促使研究人员研究水滴对蜻蜓超疏水翅膀的影响行为。这种超疏水表面被用作定向表面设计的参考，由于其在微流体、自清洁等领域的广泛适用性而受到广泛关注。在这项研究中，通过实验研究了液滴撞击蜻蜓翅膀表面的静态接触角和回弹过程，而从理论上计算了润湿压力、吉布斯自由能和斯托克斯数与恢复系数的关系，以检验动态和单向传输滴的行为。结果表明，蜻蜓翅膀的初始倾斜角与随下降滑动的滑动角相似。水滴从蜻蜓翅膀的底部反弹到远端位置，表现出定向迁移。水滴撞击蜻蜓翼面，水滴呈现压缩、恢复、分离阶段；在这三个阶段中，液滴形态不断演变。随着吉布斯自由能和横截面积的变化，随着液滴继续反弹，恢复系数降低，斯托克斯数增加。在这三个阶段中，液滴形态不断演变。随着吉布斯自由能和横截面积的变化，随着液滴继续反弹，恢复系数降低，斯托克斯数增加。在这三个阶段中，液滴形态不断演变。随着吉布斯自由能和横截面积的变化，随着液滴继续反弹，恢复系数降低，斯托克斯数增加。