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Design of Flapping Airfoil for Optimal Aerodynamic Performance in Low-Reynolds Number Flows

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Authors
Lee, Jung-Sang; Kim, Chongam; Kim, Kyu Hong
Issue Date
2006-09
Publisher
American Institute of Aeronautics and Astronautics
Citation
AIAA Journal, vol. 44, no. 9 , 2006, pp. 1960-1972
Abstract
Unsteady, viscous, incompressible flows over an airfoil under flapping motion are numerically investigated. Depending on key parameters such as Reynolds number, reduced frequency, and flapping amplitudes, a flapping airfoil could experience complex flow fields. The trailing-edge vortex plays an important role to induce inverse Kármán-vortex street which is a jetlike flow on the downstream and then generates thrust. And, the leading-edge separation vortex is closely related on the propulsive efficiency. Through careful computations of several pitching, plunging, and plunging combined with pitching modes in terms of flow and/or geometry parameters, the key physical flow phenomenon dictating the aerodynamic characteristics of flapping airfoil is identified. Based on the analysis of thrust coefficient and propulsive efficiency a new airfoil shape for optimal aerodynamic performance is proposed. The improved performance of the new flapping airfoil is validated in terms of thrust coefficient and propulsive efficiency in various low-Reynolds number flow regimes.
ISSN
0001-1452
Language
English
URI
http://hdl.handle.net/10371/6925
DOI
https://doi.org/10.2514/1.15981
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Journal Papers (저널논문_기계항공공학부)
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