Abstract
Unsteady fluid forces acting on a three dimensional airfoil in the sinusoidal pitching motion were measured by using the ring structure 2 elements balance. Furthermore, the vorticity field near the airfoil surface of the suction side was also measured by using an X-type hot wire probe. Dynamic lift/drag coefficients were compared to the steady ones. As a result, the delay of stall is observed and also the maximum lift coefficient is greater than the maximum lift coefficient under stationary condition. The dynamic stall occurs at the instant of collapse in shape of the counter-rotating vortex pair near the upper surface of the airfoil.
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