Size effects on insect hovering aerodynamics: an integrated computational study
Size effects on insect hovering aerodynamics: an integrated computational study
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DOI：
10.1088/1748-3182/4/1/015002
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发表时间：
2009-03-01
影响因子：
3.4
通讯作者：
Aono, H.
中科院分区：
文献类型：
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作者：
Liu, H.;Aono, H.
盘旋是昆虫的奇迹，各种大小的飞行昆虫都能观察到这一点。扑翼空气动力学中昆虫悬停时的尺寸效应是微型飞行器(MAV)领域感兴趣的问题，也是比较形态学家关注的问题。在这项研究中，我们提出了一项关于昆虫悬停空气动力学的尺寸效应的综合计算研究，该研究使用了一个受生物启发的动态飞行模拟器，该模拟器集成了真实翼身形态的建模、扑翼和身体运动学的建模以及内部的Navier-Stokes解算器。给出了在O(10(4))到O(10(1))的较大雷诺数范围内，四种典型昆虫(包括天蛾、蜜蜂、果蝇和蓟马)的悬停飞行的结果，证明了本文提出的综合计算方法在昆虫扑翼飞行非定常空气动力学定量模拟和评价中的可行性。因此，我们的结果基于昆虫悬停的真实模型，从而提供了对近场涡旋动力学、远场尾流和下洗结构的综合理解，以及它们与大小、雷诺数和机翼运动学方面的力产生的相关性。我们的结果不仅对昆虫悬停过程中近场和远场涡旋结构的相似性和差异性进行了综合解释，而且也证明了我们的方法可以作为MAVS设计的有效工具。
Hovering is a miracle of insects that is observed for all sizes of flying insects. Sizing effect in insect hovering on flapping-wing aerodynamics is of interest to both the micro-air-vehicle (MAV) community and also of importance to comparative morphologists. In this study, we present an integrated computational study of such size effects on insect hovering aerodynamics, which is performed using a biology-inspired dynamic flight simulator that integrates the modelling of realistic wing-body morphology, the modelling of flapping-wing and body kinematics and an in-house Navier-Stokes solver. Results of four typical insect hovering flights including a hawkmoth, a honeybee, a fruit fly and a thrips, over a wide range of Reynolds numbers from O(10(4)) to O(10(1)) are presented, which demonstrate the feasibility of the present integrated computational methods in quantitatively modelling and evaluating the unsteady aerodynamics in insect flapping flight. Our results based on realistically modelling of insect hovering therefore offer an integrated understanding of the near-field vortex dynamics, the far-field wake and downwash structures, and their correlation with the force production in terms of sizing and Reynolds number as well as wing kinematics. Our results not only give an integrated interpretation on the similarity and discrepancy of the near- and far-field vortex structures in insect hovering but also demonstrate that our methods can be an effective tool in the MAVs design.