楕円柱の風力特性に及ぼす突風の立ち上がり時間の影響に関する検討

概要

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The characteristics of wind forces acting on an elliptic cylinder with an angle of attack subjected to step-function-like gusts were investigated using a specially equipped wind gust tunnel. We confirmed some overshoot phenomena of wind forces, which developed rapidly, much bigger than the steady forces in the corresponding steady flow by the tests with some attack angles. The drag coefficients of the cylinder both in the steady flow and in the peak of the overshoot increase with the angle of attack. Although the lateral force coefficient in the steady flow becomes the maximum at the attack angle of 20 deg, the maximum of those in the peak of overshoot occurs at 30 deg. Finally we showed that those overshoot phenomena are able to be explained by a non-dimensional rise time defined by the size of cylinder, the wind speed and the rise time.
九州大学大学院人間環境学研究院都市・建築学部門,Faculty of Human-Environment Studies, Kyushu Universityの論文
2009-01-15