TwoDimensional Mechanism of High Lift by a Single Flapping Wing
Abstract
Numerical simulations are conducted to investigate the mechanism of hovering flight with an inclined stroke. The numerical method used is based on an immersed boundary method in Cartesian coordinates. The Reynolds number considered is Re = 150 based on the maximum translational velocity and chord length of the wing. The stroke plane angles of the hovering flight are 0^rc, 30^rc, 60^rc, 75^rc and 90^rc. The angles between the chord axis and the stroke plane are varied from 30^rc to 90^rc for each stroke plane angle. Results show that for each stroke plane angle, there is an optimal angle of attack to maximize the vertical force. It is shown that wake capturing reduces the negative vertical force during the upstroke below the stroke angle of 60^rc. The effect of wake capturing increases with the Reynolds number. Finally, circulation due to wing rotation also increases the vertical force when rotation occurs earlier near the end of downstroke.
 Publication:

APS Division of Fluid Dynamics Meeting Abstracts
 Pub Date:
 November 2003
 Bibcode:
 2003APS..DFD.AE006C