周期変動流中の単独翼まわりの圧力分布 : 第1報, 平板翼近似

概要

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This paper describes on theoretical and experimental pressure distributions around an airfoil placed in a periodically fluctuating air flow. As a result, 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 amplitudes of fluctuating pressures increase approximately in proportion to that of air velocity. Furthermore, these values are farely 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. This fact is estimated insufficiently by the theory. (4) It becomes clear that it is necessary to consider the distribution of the airfoil thickness in order to caluculate the time averaged values and phase angles with good accuracy.
1983-12-25