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Design of Flapping Airfoil for Optimal Aerodynamic Performance in Low-Reynolds Number Flows
Cited 18 time in
Web of Science
Cited 34 time in Scopus
- Authors
- Issue Date
- 2006-09
- 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
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