| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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A combined airfoil with secondary feather inspired by the golden eagle and its influences on the aerodynamics |
| Di Tang(唐迪)1,2, Zhongyong Fan(范忠勇)3, Mingxia Lei(雷鸣霞)3, Binbin Lv(吕彬彬)2, Li Yu(余立)2, Hao Cui(崔浩)4 |
1 College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2 High Speed Aerodynamic Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
3 Zhejiang Museum of Natural History, Hangzhou 310014, China;
4 Shenyang Aircraft Design and Research Institute of AVIC, Shenyang 110035, China |
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Abstract Bird flight is a remarkable adaption that has allowed thousands of species to colonize all terrestrial habitats. A golden eagle has impressive flying abilities, such as hovering, perching, preying and attacking. To reveal the flying abilities, avian geometry of a golden eagle was extracted based on noncontact surface measurements using a ROMBER three-dimensional laser scanner. Distributions of a camber line, thickness and a secondary feather line of the extracted point cloud were fitted using convenient analytical expressions. A traditional airfoil was established with the camber line and thickness, then a combined airfoil was constructed by combining the traditional airfoil with a secondary feather. Oscillations of an airfoil as well as rapid pitch up were simplified as a sine wave around the quarter chord axis. Thereafter, both steady and unsteady aerodynamic performances of the airfoil are computed, the influences of the secondary feather on the steady and unsteady aerodynamics were further studied.
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Received: 08 August 2018
Revised: 17 December 2018
Accepted manuscript online:
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PACS:
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47.32.cd
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(Vortex stability and breakdown)
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47.32.Ff
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(Separated flows)
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Corresponding Authors:
Di Tang
E-mail: tangdi@zjut.edu.cn
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Cite this article:
Di Tang(唐迪), Zhongyong Fan(范忠勇), Mingxia Lei(雷鸣霞), Binbin Lv(吕彬彬), Li Yu(余立), Hao Cui(崔浩) A combined airfoil with secondary feather inspired by the golden eagle and its influences on the aerodynamics 2019 Chin. Phys. B 28 034702
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