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

作　　者：Di Tang Dawei Liu Yin Yang Yang Li Xipeng Huang Kai Liu 唐迪;刘大伟;杨茵;李阳;黄喜鹏;刘凯(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;High Speed Aerodynamic Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China;Chengdu State-Owned Jinjiang Machine Factory,Chendu 610043,China)

机构地区：[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

出　　处：《Chinese Physics B》2021年第3期335-345,共11页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.51705459);the Natural Science Foundation of Zhejiang Province,China(Grant No.LY20E050022).

摘　　要：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.Aλ-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.

关 键 词：biomaterial FEATHER LEAKAGE large prey microstructure barbules CROSS-SECTION AERODYNAMICS 

分 类 号：Q958[生物学—动物学]