A wind tunnel test study on aerodynamic characteristics of square cylinders with rounded corners

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (24) : 59-68.

YANG Qun1,2,3，YU Chang3，YU Wenwen3，LIU Xiaobing1,2,3

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Abstract

The surface wind pressure of the standard square cylinder and the rounded square cylinder with rounded corner ratios of 0.1, 0.2, 0.3 and 0.4 were measured in a uniform flow field with rigid model wind tunnel test at Reynolds number Re=120,000 and wind direction angles from 0° to 45°, and the influence of wind direction angles and rounded corner ratios on the aerodynamic characteristics of the model was analyzed. The results show that: with the increase of the wind direction angle, the mean drag coefficient of the rounded square cylinder decreases initially, then increases, and eventually levels off, and while the mean lift coefficient increases after the first decrease, and finally tends to be stable. The wind direction angle which the rounded square cylinder mean lift and drag coefficient secures the most (or least) value at is less than standard square cylinder, of which the rounded square cylinder with the corner ratio of 0.1 around 7.5°, and with rounded corner ratio of 0.2, 0.3, and 0.4 are around 5°. When the wind direction angles are less than 10°, with the increase of the wind direction angle, the fluctuating lift coefficient of the rounded square cylinder decreases first and then increases, and is much smaller than that of the standard square cylinder. When the wind direction angles are more than 10°, with the increase of the wind direction angle, the fluctuating lift coefficient of the rounded square cylinder have little change and is slightly larger than that of the standard square cylinder. The Strouhal number of the rounded square cylinder increased first and then decreased with the increase of the wind direction angle, and that maximum value gradually increases with the increase of the rounded corner ratio.

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square cylinder with rounded corner / wind tunnel test / aerodynamic characteristics / rounded corner ratio / wind direction angle

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YANG Qun1,2,3，YU Chang3，YU Wenwen3，LIU Xiaobing1,2,3. A wind tunnel test study on aerodynamic characteristics of square cylinders with rounded corners[J]. Journal of Vibration and Shock, 2023, 42(24): 59-68

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