Pressure Distributions around an Airfoil Placed in a Periodically Fluctuating Air Flow : 1st Report, A Flat Plate Approximation

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This paper describes theoretically and experimentally obtained pressure distributions around an airfoil placed in a periodically fluctuating air flow. The following facts are found out: (1) When the amplitude of fluctuating velocity is small, the time averaged pressure distributions are nearly equal to those in steady flows. (2) The amplitude of fluctuating pressures increases approximately in proportion to that of air velocity. Furthermore, the values are fairly well predicted by the flat plate airfoil theory. (3) The angle of lead of the pressure fluctuation to the velocity becomes smaller in the decelerating regions and larger in the accelerating regions. The above is not well predictable by the theory. (4) It is clear that it is necessary to consider the distribution of the airfoil thicknesses in order to calculate the time averaged values and phase angles with high accuracy.
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