Aspect Ratio Effects on the Aerodynamic Performance of a Biomimetic Hummingbird Wing in Flapping.
Aspect Ratio Effects on the Aerodynamic Performance of a Biomimetic Hummingbird Wing in Flapping.
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DOI：
10.3390/biomimetics8020216
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发表时间：
2023-05-23
期刊：
影响因子：
4.5
通讯作者：
Shao, Xueming
中科院分区：
文献类型：
--
作者：
Min, Yilong;Zhao, Gengyao;Pan, Dingyi;Shao, Xueming
关键词：
蜂鸟是一种有翅膀的生物，有着独特的飞行机制。它们的飞行模式与昆虫比其他鸟类更相似。因为蜂鸟的飞行模式在很小的范围内提供了很大的升力，所以它们可以在拍打翅膀的同时保持悬停。这一特征具有很高的研究价值。为了了解蜂鸟翅膀的增升机理，基于蜂鸟的悬停和扑翼过程建立了运动学模型，并设计了不同展弦比的蜂鸟翅膀模型。因此，本研究利用计算流体动力学方法，探讨展弦比变化对蜂鸟悬停与扑翼时气动特性的影响。通过两种不同的定量分析方法，升力系数和阻力系数的结果显示出完全相反的趋势。因此，为了更好地评价不同展弦比下的气动特性，引入了升阻比，发现AR = 4时升阻比达到较高值。对功率因数的研究也得到了类似的结论，表明AR = 4的仿生蜂鸟翅膀具有较好的气动特性。此外，研究的压力云图和涡图在扑动过程中，导致的影响，在蜂鸟的翅膀周围的流场的展弦比的阐明，以及这些影响如何最终导致改变鸟类的翅膀的气动特性。
Hummingbirds are flapping winged creatures with unique flight mechanisms. Their flight pattern is more similar to insects than other birds. Because their flight pattern provides a large lift force at a very small scale, hummingbirds can remain hovering while flapping. This feature is of high research value. In order to understand the high-lift mechanism of hummingbirds’ wings, in this study a kinematic model is established based on hummingbirds’ hovering and flapping process, and wing models imitating the wing of a hummingbird are designed with different aspect ratios. Therefore, with the help of computational fluid dynamics methods, the effect of aspect ratio changes on the aerodynamic characteristics of hummingbirds’ hovering and flapping are explored in this study. Through two different quantitative analysis methods, the results of lift coefficient and drag coefficient show completely opposite trends. Therefore, lift–drag ratio is introduced to better evaluate aerodynamic characteristics under different aspect ratios, and it is found that the lift–drag ratio reaches a higher value when AR = 4. A similar conclusion is also reached following research on the power factor, which shows that the biomimetic hummingbird wing with AR = 4 has better aerodynamic characteristics. Furthermore, the study of the pressure nephogram and vortices diagram in the flapping process are examined, leading to elucidation of the effect of aspect ratio on the flow field around hummingbirds’ wings and how these effects ultimately lead to changes in the aerodynamic characteristics of the birds’ wings.
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