Hou Dan, Tan Biao, Shi Binghao, Zhong Zheng
Department of Mechanical Engineering, Shanghai Maritime University, Shanghai 201306, China.
School of Science, Harbin Institute of Technology, Shenzhen 518055, China.
Biomimetics (Basel). 2024 Jul 17;9(7):433. doi: 10.3390/biomimetics9070433.
The aerodynamic effects of wing corrugation on insect flight have received widespread attention. However, there has hardly been any specific focus on dynamic changes to corrugation angle in the models. The flexible vein joints containing resilin in the wings of dragonflies and damselflies enable the longitudinal veins to rotate and thereby change the corrugation angles throughout flapping cycles. Therefore, a two-dimensional corrugated airfoil with time-varying corrugation angles is proposed and the aerodynamic performance is evaluated in terms of aerodynamic force, power and efficiency. The results indicate that the airfoil with time-varying corrugations outperforms the rigid one in terms of enhancing thrust and reducing power consumption. The aerodynamic performance of time-varying corrugated airfoils is optimal when the angle varies in a specific range, and an excessively large angle variation may have negative effects. In addition, excessive height or a negative leading edge of the corrugation can lead to a reduction in the thrust. A design concept for the 2D airfoil with time-varying corrugations is provided and the findings are of significance for enhancing the aerodynamic performance of biomimetic flexible flapping-wing vehicles.
翅膀波纹对昆虫飞行的空气动力学影响已受到广泛关注。然而，在模型中几乎没有对波纹角度的动态变化进行任何具体研究。蜻蜓和豆娘翅膀中含有 resilin 的柔性静脉关节能使纵向静脉旋转，从而在整个扑翼周期中改变波纹角度。因此，提出了一种具有随时间变化波纹角度的二维波纹翼型，并从气动力、功率和效率方面评估其空气动力学性能。结果表明，具有随时间变化波纹的翼型在增强推力和降低功耗方面优于刚性翼型。当角度在特定范围内变化时，随时间变化波纹翼型的空气动力学性能最佳，角度变化过大可能会产生负面影响。此外，波纹过高或前缘为负会导致推力降低。提供了一种具有随时间变化波纹的二维翼型的设计概念，这些发现对于提高仿生柔性扑翼飞行器的空气动力学性能具有重要意义。
