Experimental Study of Wing-Wake Interactions of Insect Flapping Wing
Experimental Study of Wing-Wake Interactions of Insect Flapping Wing
复制标题
昆虫扑翼翼迹相互作用的实验研究
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
T. Fujimoto
中科院分区：
文献类型：
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作者：
Hiroto Nagai;K. Isogai;T. Fujimoto
进行了一项实验研究，以研究昆虫在悬停和向前飞行时扑动翅膀的翼尾相互作用。使用水隧道中的动态缩放机械模型来测量作用在扑翼上的不稳定空气动力，该模型模拟昆虫的悬停和向前扑动飞行。此外，使用数字粒子图像测速（DPIV）围绕缩放的扑翼模型进行流可视化。扑动的翅膀会经历翼-尾流相互作用，即机翼与前一次扑动引起的尾流相互作用，称为尾流捕获。我们研究扑翼参数对尾流捕获的影响。结果表明，尾流捕获主要取决于两个参数：顺桨旋转的降低频率和时间。流动可视化表明，反向旋转的涡旋对在两个涡旋本身之间产生强烈的射流，增强了尾流捕获效果。向前飞行中的尾流捕获效果与悬停飞行中的尾流捕获效果不同。虽然尾流捕获在从下冲程到上冲程的冲程反转中更有效，但在从上冲程到下冲程的冲程反转中效果稍差。
An experimental study is conducted to investigate wing-wake interactions of a flapping wing of an insect in hovering and forward flight. Unsteady aerodynamic forces acting on a flapping wing are measured using a dynamically scaled mechanical model in a water tunnel, which simulates hovering and forward flapping flight of insects. In addition, flow visualization is made around the scaled flapping wing model using digital particle image velocimetry (DPIV). A flapping wing experiences wing-wake interaction that the wing interacts with the wake induced in the previous stroke, called wake capture. We investigate effects of parameters of a flapping wing on the wake capture. The results indicate that the wake capture is principally dependent on the two parameters: reduced frequency and timing of feathering rotation. And the flow visualization shows that the vortex pair with counter-rotating, which induces a strong jet flow between the two vortices themselves, enhances wake capture effect. The wake capture effect in forward flight appears in a different manner from in hovering flight. While the wake capture is more effective in the stroke reversal from the down- to up-stroke, it is slight effective in the stroke reversal from the up- to down-stroke.