Thrust generation due to airfoil flapping

Date

1996-02-01

Author

Tuncer, İsmail Hakkı

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Thrust generation on a single flapping airfoil and a flapping/stationary airfoil combination in tandem is studied parametrically. A multiblock Navier-Stokes solver is employed to compute unsteady flowfields. The unsteady flow-field around a single flapping airfoil is also computed by an unsteady potential how code, The numerical solutions predict thrust generation in flapping airfoils and a significant augmentation of thrust in flapping/stationary airfoil combinations in tandem. The propulsive efficiency is found to be a strong function of reduced frequency and the amplitude of the flapping motion. At a flapping amplitude of 0.40 chord lengths and a reduced frequency of 0.10, the propulsive efficiency of a single NACA 0012 airfoil was computed to be more than 70%. For the airfoil combination in tandem, the propulsive efficiency was augmented more than 40% at a reduced frequency of 0.75 and a flapping amplitude of 0.20 chord lengths when the airfoils are separated by about two chord lengths.

Subject Keywords

Aerospace Engineering

URI

https://hdl.handle.net/11511/40056

Journal

AIAA JOURNAL

DOI

https://doi.org/10.2514/3.13067

Collections

Department of Aerospace Engineering, Article

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Computational study of flapping airfoil aerodynamics Tuncer, İsmail Hakkı (American Institute of Aeronautics and Astronautics (AIAA), 2000-05-01) Unsteady, viscous, low-speed flows over a NACA 0012 airfoil oscillated in plunge and/or pitch at various reduced frequency, amplitude, and phase shift are computed. Vortical wake formations, boundary-layer flows at the leading edge, the formation of leading-edge vortices and their downstream convection are presented in terms of unsteady particle traces. Flow separation characteristics and thrust-producing wake profiles are identified. Computed results compare well with water tunnel flow visualization and fo...

Citation Formats

İ. H. Tuncer, “Thrust generation due to airfoil flapping,” AIAA JOURNAL, pp. 324–331, 1996, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40056.