Optimization of Flapping Motion Parameters for Two Airfoils in a Biplane Configuration

Kaya, Mustafa
Tuncer, İsmail Hakkı
Jones, Kevin D.
Platzer, Max F.
Flapping motion parameters of airfoils in a biplane configuration are optimized for maximum thrust and/or propulsive efficiency. Unsteady, viscous flowfields over airfoils flapping in a combined plunge and pitch are computed with a parallel flow solver on moving and deforming overset grids. The amplitudes of the sinusoidal pitch and plunge motions and the phase shift between them are optimized for a range of flapping frequencies. A gradient-based optimization algorithm is implemented in a parallel computing environment. The deforming overset grids employed remove the restriction on the flapping motion of airfoils, and improve the optimization results obtained earlier. In the Strouhal number range 0.17 < Sr < 0.25, an airfoil in a biplane configuration produces more thrust than a single airfoil. Yet, at a higher Strouhal number, the airfoil in a biplane configuration produced less thrust at a significantly lower efficiency than a single flapping airfoil.


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Citation Formats
M. Kaya, İ. H. Tuncer, K. D. Jones, and M. F. Platzer, “Optimization of Flapping Motion Parameters for Two Airfoils in a Biplane Configuration,” JOURNAL OF AIRCRAFT, pp. 583–592, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46655.