A new bionic MAV's flapping motion based on fruit fly hovering at low Reynolds number |
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摘 要: |
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关 键 词: | 机冀 雷诺数 数值模拟 空气动力学 |
收稿时间: | 19 July 2006 |
修稿时间: | 9 May 2007 |
A new bionic MAV’s flapping motion based on fruit fly hovering at low Reynolds number |
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Authors: | Peng Bai Erjie Cui Feng Li Weijiang Zhou Bingyan Chen |
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Institution: | (1) China Academy of Aerospace Aerodynamics, Beijing, 100074, China |
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Abstract: | On the basis of the studies on the high unsteady aerodynamic mechanisms of the fruit fly hovering the aerodynamic advantages
and disadvantages of the fruit fly flapping motion were analyzed. A new bionic flapping motion was proposed to weaken the
disadvantages and maintain the advantages, it may be used in the designing and manufacturing of the micro air vehicles (MAV’s).
The translation of the new bionic flapping motion is the same as that of fruit fly flapping motion. However, the rotation
of the new bionic flapping motion is different. It is not a pitching-up rotation as the fruit fly flapping motion, but a pitching-down
rotation at the beginning and the end of a stroke. The numerical method of 3rd-order Roe scheme developed by Rogers was used
to study these questions. The correctness of the numerical method and the computational program was justified by comparing
the present CFD results of the fruit fly flapping motion in three modes, i.e., the advanced mode, the symmetrical mode and
the delayed mode, with Dickinson’s experimental results. They agreed with each other very well. Subsequently, the aerodynamic
characteristics of the new bionic flapping motion in three modes were also numerically simulated, and were compared with those
of the fruit fly flapping. The conclusions could be drawn that the high unsteady lift mechanism of the fruit fly hovering
is also effectively utilized by this new bionic flapping. Compared with the fruit fly flapping, the unsteady drag of the new
flapping decreases very much and the ratio of lift to drag increases greatly. And the great discrepancies among the mean lifts
of three flapping modes of the fruit fly hovering are effectively smoothed in the new flapping. On the other hand, this new
bionic flapping motion should be realized more easily. Finally, it must be pointed out that the above conclusions were just
drawn for the hovering flapping motion. And the aerodynamic characteristics of the new bionic flapping motion in forward flight
are going to be studied in the next step.
The project supported by the National Natural Science Foundation of China (10232010, 10032060, 90605005). |
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Keywords: | Flapping wing Low Reynolds number MAV’ s Unsteady Numerical simulation |
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