Abstract
Unsteady fluid forces acting on a three dimensional model in the sinusoidal pitching motions under conditions of several frequencies were measured by using the ring type balance with 2 components of force in a wind tunnel at Reynolds numbers 1.0×10^5 and 2.0×10^5. Dynamic lift/drag coefficients were compared to the steady ones. In this study, in order to investigate the effect of leading edge profile on unsteady fluid forces, several types of model (circular, triangular and square shapes) were installed. Furthermore, the circular type models have two cross-section shapes (NACA0015 and rectangular). The delay of stall for the pitching models is observed and also the value of maximum lift coefficient is greater than the maximum lift coefficient under stationary condition. The unsteady fluid forces are affected by the differences of the leading edge vortex due to the different leading edge profile.
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