Abstract
Unsteady fluid forces acting on a disc with several anharmonic periodic pitching motions under conditions of several frequencies were measured by using load cell in a wind tunnel at Re numbers 1.0×10^5 and 2.0×10^5. Dynamic lift/drag coefficients were compared with the steady ones. Moreover, we investigated the ratio between maximum dynamic lift and maximum quasi static lift versus reduced frequencies. The results showed that the dynamic lift/drag coefficient curves in the anharmonic pitching motion were only shifted compared with those in the sinusoidal pitching motion. However, it was found that the fast up-stroke gave high maximum dynamic lift coefficient.
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