한국전산유체공학회:학술대회논문집
- 2006.05a
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- Pages.263-267
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- 2006
PATH OPTIMIZATION OF FLAPPING AIRFOILS BASED ON NURBS
- Kaya Mustafa (Middle East Technical University Ankara) ;
- Tuncer Ismail H. (Middle East Technical University Ankara)
- Published : 2006.05.01
Abstract
The path of a flapping airfoil during upstroke and down-stroke is optimized for maximum thrust and propulsive efficiency. The periodic flapping motion in combined pitch and plunge is described using Non-Uniform B-Splines(NURBS). A gradient based algorithm is employed for optimization of the NURBS parameters. Unsteady, low speed laminar flows are computed using a Navier-Stokes solver in a parallel computing environment based on domain decomposition. It is shown that the thrust generation is significantly improved in comparison to the sinusoidal flapping motion. For a high thrust generation, the airfoil stays at a high effective angle of attack for short durations.
Keywords