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Chin. Phys. B, 2021, Vol. 30(3): 034701    DOI: 10.1088/1674-1056/abc3b6
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Leakage of an eagle flight feather and its influence on the aerodynamics

Di Tang (唐迪)1,2,†, Dawei Liu(刘大伟)2,‡, Yin Yang(杨茵)2, Yang Li(李阳)2, Xipeng Huang(黄喜鹏)1, and Kai Liu(刘凯)3
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 Chengdu State-Owned Jinjiang Machine Factory, Chendu 610043, China
Abstract  We investigate how the barb of bird feathers is changed along both the rachis and barb. To investigate the microstructures and the mechanical behaviors of barbs, a series of barbs are manually cut from an eagle's primary feather to observe the cross sections. A Λ -like cross section with a tiny hook is observed at the right feet at each section. Afterwards, a measurement of the setup system is developed to evaluate the leakage ratio of a feather followed by a numerical predicting approach based on the CFD method. It is found that the air leakage increases linearly against the pressure, and the predicted results coincide well with the experimental results. Finally, the influences of leakage of the flight feather on both steady and unsteady aerodynamics are studied.
Keywords:  biomaterial      feather      leakage      large prey      microstructure      barbules      cross-section      aerodynamics  
Received:  23 July 2020      Revised:  16 September 2020      Accepted manuscript online:  22 October 2020
PACS:  47.32.cd (Vortex stability and breakdown)  
  47.32.Ff (Separated flows)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51705459) and the Natural Science Foundation of Zhejiang Province, China (Grant No. LY20E050022).
Corresponding Authors:  Corresponding author. E-mail: tangdi@zjut.edu.cn Corresponding author. E-mail: 13404019740@163.com   

Cite this article: 

Di Tang (唐迪), Dawei Liu(刘大伟), Yin Yang(杨茵), Yang Li(李阳), Xipeng Huang(黄喜鹏), and Kai Liu(刘凯) Leakage of an eagle flight feather and its influence on the aerodynamics 2021 Chin. Phys. B 30 034701

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