Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.
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Details of pressure distributions on a two dimensional heaving airfoil, at low-speed wind tunnel are presented. Dynamic heaving motion was produced by oscillating model up to k = 0.05. All experiments were conducted at 5 Re = 2 ×10 . The amplitudes of oscillations and mean angles of attack were varied to determine their effects on pressure distributions. At different amplitudes, the hysteresis loops in the pressure data was both clockwise and counter clockwise when plotted against the equivalent angle of attack. It was found that heaving amplitudes had strong effects in pressure distribution, near the leading edge of the airfoil. At the aft portion, it seems that during the oscillatory motions the flow was mostly separated.