昆虫拍动翅的非定常变形对其气动力的影响

杜刚; 孙茂

昆虫拍动翅的非定常变形对其气动力的影响

杜刚¹,
孙茂²

1.
北京航空航天大学发动机数值仿真中心,北京 100083;2.北京航空航天大学流体所,北京 100083

详细信息

作者简介:
杜刚(1974- ),男,四川省邻水人,博士(联系人.E-mail:dugang@buaa.edu.cn).

中图分类号: O355
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- 被引次数: 0
出版历程
- 收稿日期: 2007-01-17
- 修回日期: 2008-04-17
- 刊出日期: 2008-06-15

Effects of Unsteady Deformation of a Flapping Wing on Its Aerodynamic Forces

LIU Xin-jian¹,
YUAN Tian-bao²

1.
Aeroengine Numerical Simulation Research Center, Beijing University of Aeronautics and Astronautics, Beijing 100083, P. R. China;

摘要

摘要: 通过在动态变形网格上求解N-S方程的方法，研究了昆虫拍动翅的非定常变形对其气动力的影响．其中，拍动翅的扭转变形对气动力影响很小，拱形变形则会产生显著的影响，扭转和拱形组合变形的效果与拱形变形单独的效果基本相同．在6%拱形和20度扭转组合变形的情况下（此为对大量昆虫观察所得到的典型值），相对于无变形平板翅，升力增加了10～20%，升阻比增加了约10%．翅膀的变形可增大最大升力系数；同时，可减小飞行的能耗，例如，对于做悬停飞行的熊蜂，其翅膀的动态变形（6%拱形和20度扭转组合变形）使其飞行中的能耗比无变形情况降低了约16%．
- 昆虫 /
- 翅膀变形 /
- 非定常空气动力 /
- 计算流体力学
Abstract: The effects of unsteady deformation of a flapping model insect wing on its aero dynamic force production were studied by solving the Navier-Stokes equations on a dynamically deforming grid. Aerodynamic forces on the flapping wing are little affected by consider abletwist, but are affected by camber deformation; the effect of combined camber and twist deformation is similar to that of camber deformation. With a de formation of 6% camber and 20 degrees twist (typical values observed forwings of many insects), lift is increased by 10~20% and lift-to-dragratio by around 10% compared with the case of rigid flat-plate wing. As a result, the deformation canincrease the maximum lift coefficient of aninsect, and candecrease its power requirement of flight, e. g., for a hovering bumblebee with dynamically deforming wings (6% camber and 20 degrees twist), aerodynamic power required is de creased by about 16% compared with the case of rigid wings.
- insects /
- wing deformation /
- unsteady aerodynamic forces /
- computational fluid dynamics

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参考文献(26)

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