THE AERODYNAMICS OF HOVERING INSECT FLIGHT .4. AERODYNAMIC MECHANISMS
THE AERODYNAMICS OF HOVERING INSECT FLIGHT .4. AERODYNAMIC MECHANISMS
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DOI：
10.1098/rstb.1984.0052
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发表时间：
1984-01-01
期刊：
影响因子：
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通讯作者：
ELLINGTON, CP
中科院分区：
文献类型：
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作者：
ELLINGTON, CP
结合理论和实验研究，讨论了悬停动物飞行升力产生的气动机理。定常薄翼型理论与实测升力系数的比较表明，前缘分离泡很可能是昆虫飞行中的一个显著特征。昆虫的翅膀表现出一个渐进的失速，这是特征薄的轮廓在雷诺数（Re）小于约105。在这类失速中，气流在尖锐的前缘分离，然后在下游重新附着到上翼面，产生一个包围着再循环流的有限分离区。由此产生的前缘气泡增强了薄翼型的弯度和厚度，从而提高了低Re时的升力。一些鸟翼剖面的结果表明，前缘气泡的复杂性甚至可能在鸟的快速向前飞行中被发现。
Theoretical considerations and available experimental studies are combined for a discussion on the aerodynamic mechanisms of lift generation in hovering animal flight. A comparison of steady-state thin-aerofoil theory with measured lift coefficients reveals that leading edge separation bubbles are likely to be a prominent feature in insect flight. Insect wings show a gradual stall that is characteristic for thin profiles at Reynolds numbers (Re) less than about 105. In this type of stall, flow separates at the sharp leading edge and then re-attaches downstream to the upper wing surface, producing a region of limited separation enclosing a recirculating flow. The resulting leading edge bubble enhances the camber and thickness of the thin profile, improving lift at low Re. Some of the results for bird wing profiles indicate that the complications of leading edge bubbles might even be found in the fast forward flight of birds.