Three-dimensional effects of unsteady flapping rectangular plates

doi:10.7523/j.issn.2095-6134.2010.1.001

Abstract

Abstract:

Aerodynamic responses of rectangular plates with different aspect ratios during flapping motion were simulated using a three dimensional unsteady panel code. The three-dimensional effects during plunging and pitching motions were then analyzed. The results demonstrated that the added mass only contributes to the instaneous lift force. The amplitudes of lift forces induced by added mass effects would decrease with a decreasing aspect ratio, but the time-averaged contributions were always zero. Vortices shedding from trailing and side edges of rectangular plates are sources of time-averaged lift forces. As the signature of streamwise vortices would change during one flapping cycle, the three-dimensional effects on vortex-induced lift forces would reduce as the flow unsteadiness increased.

Key words: rectangular plate, flapping, three-dimensional effects, unsteady panel methods

CLC Number:

O 035

SUN Yi-Feng, BAO Lin, YU Yong-Liang. Three-dimensional effects of unsteady flapping rectangular plates[J]. , 2010, 27(1): 1-9.

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