Fluid-structure interaction enhances the aerodynamic performance of flapping wings: a computational study
Fluid-structure interaction enhances the aerodynamic performance of flapping wings: a computational study
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DOI：
10.1299/jbse.17-00666
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发表时间：
2018
影响因子：
--
通讯作者：
T. Nakata;R. Noda;Hao Liu
中科院分区：
文献类型：
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作者：
T. Nakata;R. Noda;Hao Liu
昆虫翅膀在扑动过程中受气动力和惯性力的作用而被动地改变其形状，这对昆虫的气动性能有很大的影响。为了证实流固耦合在扑翼空气动力学中的重要性，我们进行了计算流固耦合分析的悬停天蛾与“虚拟”真空条件，可以调整的气动力对扑翼变形的影响。结果表明，如前所述，大部分机翼变形（如扭转）是由惯性力引起的，但气动力对机翼变形的调节会对扑翼的运动学和空气动力学产生很大影响。虽然无论气动力的贡献如何，机翼变形都可以增加扑翼的气动功率、力和效率，但响应于扑翼的非定常气动力而调整的机翼变形可以进一步提高扑翼的气动性能。这些结果不仅揭示了机翼变形对扑翼气动性能的影响，而且指出了流固耦合在昆虫飞行空气动力学和仿生微型飞行器设计中的重要意义。
Insect wings change its shape passively by the aerodynamic and inertial forces when flapping, which can greatly affect its aerodynamic performances. In order to confirm the importance of the fluid-structure interaction in flapping wing aerodynamics, we performed computational fluid-structure interaction analyses of a hovering hawkmoth with ‘virtual’ vacuum conditions that can adjust the effect of the aerodynamic force on the deformation of flapping wings. It is turned out that the large part of the wing deformation, such as the wing twist, is induced by the inertial force as reported previously, but the adjustment of the wing deformation by the aerodynamic force can greatly affect the kinematics and the aerodynamics of flapping wings. While the wing deformation, regardless of the contribution of the aerodynamic force, can increase the aerodynamic power, force and efficiency of flapping wings, the wing deformation adjusted in response to the unsteady aerodynamics of flapping wings can further enhance the aerodynamic performance. These results not only reveal the influence of the wing deformation on the aerodynamic performance of flapping wings, but also point out the great importance of the fluid-structure interaction in the aerodynamics of insect flight and the design of bio-inspired micro aerial vehicles.