Optimization of flapping airfoils for maximum thrust and propulsive efficiency

The thrust and/or propulsive efficiency of a single flapping airfoil is-maximized by using a numerical optimization method based on the steepest ascent. The flapping motion of the airfoil is described by a combined sinusoidal plunge and pitching motion. Optimization parameters are taken to be the amplitudes of the plunge and pitching motions and the phase shift between them at a fixed flapping frequency. Two-dimensional, unsteady, low-speed, laminar, and turbulent flows are computed by using a Navier-Stokes solver on moving overset grids. Computations are performed in parallel in a computer cluster. The optimization data show that high thrust values may be obtained at the expense of propulsive efficiency. For a high propulsive efficiency, the effective angle of attack of the airfoil is reduced, and large-scale vortex formations at the leading edge are prevented.
Citation Formats
İ. H. Tuncer and M. Ç. Kaya, “Optimization of flapping airfoils for maximum thrust and propulsive efficiency,” pp. 2329–2336, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/29913.