Optimization of Flapping Airfoils For Maximum Thrust and Propulsive Efficiency

  • Tuncer I
  • Kaya M
  • 44

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Abstract

Thethrust and/or propulsive efficiency of a single flapping airfoil is maximizedbyusing 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.

Author-supplied keywords

  • flapping airfoils
  • moving overset grids
  • optimization
  • unsteady aerodynamics

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Authors

  • Ismail Tuncer

  • Mustafa Kaya

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