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Role of Soft Matter in the Sandwich Vein of Dragonfly Wing in Its Configuration and Aerodynamic Behaviors |
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| Authors: | Xishu Wang Zhihao Zhang Huaihui Ren Yinglong Chen Bisheng Wu |
| Affiliation: | 1. Department of Engineering Mechanics, Applied Mechanics Laboratory, Tsinghua University, Beijing 100084, China;2. Department of Engineering Mechanics, Applied Mechanics Laboratory, Tsinghua University, Beijing 100084, China;China Longyuan Power Group Corporation Limted, China Goudian, Beijing 100034, China;3. Department of Engineering Mechanics, Applied Mechanics Laboratory, Tsinghua University, Beijing 100084, China;Department of Mechanical Engineering, Purdue University, West Lafayette, 47907, USA;4. CSIRO Energy, 71 Normanby Road, Clayton, VIC3168, Australia |
| Abstract: | The microstructure of the main longitudinal veins of the dragonfly wing and the aerodynamic behaviors of the wing were investigated in this paper.The microstructure of longitudinal vein presents two circumferential chitin layers and a protein-fiber soft layer.The dragonfly wing is corrugated due to the spatial arrangement of longitudinal veins.It was found that the corrugation angle could significantly influence the lift/drag ratio across a range of attack angles by the wind tunnel experiments.The results of the finite element analysis indicate that the protein soft layer of vein facilitates the change of the corrugation angle by allowing substantial relative twisting deformation between two neighboring veins,which is not possible in veins without a soft sandwich layer. |
| Keywords: | dragonfly wing longitudinal vein sandwich structure soft matter corrugation behavior |
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