振動流中の円柱および正方形柱に作用する流体力の測定と流れの可視化

概要

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The forces acting on and the flow patterns around a rigid bluff body submerged in oscillatory flow were studied. The force coefficients of a circular cylinder were measured and compared with those of other studies in a U-tube water tank to verify the experimental set-up. Then, measurements of both in-line and transverse forces of a square cylinder at an angle of attack of 0° were made in a relatively wide range of Keulegan-Carpenter numbers from 1 to 90. For the circular and square cylinders, the force signals were spectrally analyzed to get predominant frequencies. Flow visualization was also employed to confirm the correspondence between flow patterns and force coefficients. It is found that, for the present models of bluff bodies, several classes of flow patterns appear within the measured KC number range and the vortex motions closely corresponds to variations of the inline and transverse forces.
1997-11-25