Effect of feathers on drag in plunge-diving birds,Annals of the New York Academy of Sciences

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Effect of feathers on drag in plunge-diving birds
Annals of the New York Academy of Sciences ( IF 4.1 ) Pub Date : 2024-07-04 , DOI: 10.1111/nyas.15181
Florent Debenedetti ₁ , Sunghwan Jung ₂

Affiliation

This study explores the impact of feathers on the hydrodynamic drag experienced by diving birds, which is critical to their foraging efficiency and survival. Employing a novel experimental approach, we analyzed the kinematics of both feathered and nonfeathered projectiles during their transition from air to water using high-speed imaging and an onboard accelerometer. The drag coefficients were determined through two methods: a direct calculation from the acceleration data and a theoretical approach fitted to the observed velocity profiles. Our results indicate that feathers significantly increase the drag force during water entry, with feathered projectiles exhibiting approximately double the drag coefficient of their smooth counterparts. These findings provide new insights into the role of avian feather morphology in diving mechanics and have potential implications for the design of bioinspired aquatic vehicles in engineering. The study also discusses the biological implications of increased drag due to feathers and suggests that factors such as body shape might play a more critical role in the diving capabilities of birds than previously understood.

中文翻译：

羽毛对跳水鸟类阻力的影响

这项研究探讨了羽毛对潜水鸟类所经历的水动力阻力的影响，这对于它们的觅食效率和生存至关重要。采用一种新颖的实验方法，我们使用高速成像和机载加速度计分析了羽毛和非羽毛射弹从空气过渡到水中的运动学。阻力系数通过两种方法确定：根据加速度数据直接计算和适合观察到的速度剖面的理论方法。我们的结果表明，羽毛显着增加了入水过程中的阻力，羽毛弹丸的阻力系数大约是光滑弹丸的两倍。这些发现为鸟类羽毛形态在潜水力学中的作用提供了新的见解，并对工程中仿生水下交通工具的设计具有潜在影响。该研究还讨论了羽毛引起的阻力增加的生物学影响，并表明体形等因素可能在鸟类的潜水能力中发挥比以前理解的更关键的作用。

更新日期：2024-07-04

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