Leading-edge vortex lifts swifts
Leading-edge vortex lifts swifts
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DOI：
10.1126/science.1104682
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发表时间：
2004-12-10
期刊：
影响因子：
56.9
通讯作者：
Povel, GDE
中科院分区：
文献类型：
--
作者：
Videler, JJ;Stamhuis, EJ;Povel, GDE
目前对鸟类如何飞行的理解必须加以修正，因为鸟类以一种非传统的方式使用它们的手翼来产生升力和阻力。在水洞中，对一种常见的雨燕翼进行了60 °后掠滑翔姿态的物理模型试验。与流的相互作用进行了定量测量与数字粒子图像测速技术在雷诺数现实的滑翔飞行之间的3750和37500。结果表明，滑翔翼在小迎角（5 ° ~ 10 °）时能产生稳定的前缘涡。我们认为，大多数鸟类的臂翼周围的流动可以保持传统的附着，而后掠手翼产生升力与前缘涡。
The current understanding of how birds fly must be revised, because birds use their hand-wings in an unconventional way to generate lift and drag. Physical models of a common swift wing in gliding posture with a 60degrees sweep of the sharp hand-wing leading edge were tested in a water tunnel. Interactions with the flow were measured quantitatively with digital particle image velocimetry at Reynolds numbers realistic for the gliding flight of a swift between 3750 and 37,500. The results show that gliding swifts can generate stable leading-edge vortices at small (5degrees to 10degrees) angles of attack. We suggest that the flow around the arm-wings of most birds can remain conventionally attached, whereas the swept-back hand-wings generate lift with leading-edge vortices.