Pressure Distribution Around an Airfoil Placed in a Periodically Fluctuating Air Flow : 2nd Report, A thin airfoil approximation

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This paper theoretically and experimentally investigates pressure distributions around and airfoil places in a periodically fluctuating airflow. The calculated results agree fairly well with experimental results, because of the airfoil thickness being taken into account under the assumption of a thin airfoil. The following facts are, furthermore, found out: (1) The time averaged pressure disctributions consist of quasi-steady components, independent of the reduced frequency, and nearly equal to those for steady flow conditions in the range of small fluctuating amplitudes. (2) The amplitude of the first harmonic component of the unsteady pressures is in proportion to that of the velocity fluctuation and comes under the influence of the virtual mass with the growth of the reduced frequency. (3) The phase of pressure fluctuation leads to that of velocity wave and is independent of fluctuating amplitudes. The phase difference becomes larger in the accelerating region and smaller in the decelerating region in the chordwise direction.
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