开槽翼尖的多核漩涡对鸟类滑翔和扑翼飞行的支撑作用

2018/12/13   下载量： 3 次

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应用领域 航空航天
检测样本 航空
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参考标准 无需

以寒鸦为测试对象。在风洞中，采用LaVision公司的时间分辨2D3C立体PIV测量系统，对开槽翼尖的多核漩涡对鸟类滑翔和扑翼飞行的支撑作用进行了研究。实验装置包括一台英国Litron公司的LDY304PIV高重复频率激光器，两台Imager pro HS 4M型高速相机，和DaVis8.4软件平台构成。

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Slotted wing tips of birds are commonly considered an adaptation to improve soaring performance, despite their presence in species that neither soar nor glide. We used particle image velocimetry to measure the airflow around the slotted wing tip of a jackdaw (Corvus monedula) as well as in its wake during unrestrained flight in a wind tunnel. The separated primary feathers produce individual wakes, confirming a multi-slotted function, in both gliding
and flapping flight. The resulting multi-cored wingtip vortex represents a spreading of vorticity, which has previously been suggested as indicative of increased aerodynamic efficiency. Considering benefits of the slotted wing tips that are specific to flapping flight combined with the wide phylogenetic occurrence of this configuration, we propose the hypothesis that slotted
wings evolved initially to improve performance in powered flight.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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