Experimental study on the effects of aspect ratios on the aerodynamic characteristics of a smooth cylinder

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 195-201.

HUANG Bocheng1,MA Wenyong1,2,CHAI Xiaobing1,ZENG Jianping3,YANG Jiayi3

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Abstract

Circular cylinder members are widely used in civil engineering.Wind induced large-amplitude vibration often occurs in slender structures with circular cross-sections.The mostly used testing models are usually sectional models because of the limitation of wind tunnels.Therefore, the aspect ratio is a significant parameter in aerodynamic force test in wind tunnels.The local aerodynamic forces at the middle of the cylinders at the subcritical, critical and supercritical Reynolds number were measured for several models with various aspect ratios through the pressure measurement on rigid section models in the wind tunnel.The results show that the variation of aerodynamic forces is discontinuous along with the change of the aspect ratio, and the variation is different in subcritical, critical and super critical regions, when the end plate with 4 times diameter of the cylinder is mounted.In the subcritical region, when the aspect ratios is less than 9, the aerodynamic results at the span middle are greatly influenced by the aspect ratio, and the results are quite different from the results of the two-dimensional cylinder tests.In the critical Reynolds number range, the results of the aerodynamic test at the span middle are less influenced by the aspect ratio, and exhibit stronger three-dimensional characteristics.The stable single separating bubble could be observed only when the aspect ratio is not less than 11, in supercritical regions, when the aspect ratios is less than 9, the flow state of the cylinder enters into a single separating bubble basin.

Key words

a smooth cylinder ;aspect ratios / aerodynamic characteristics / critical Reynolds number range / wind tunnel test

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HUANG Bocheng1,MA Wenyong1,2,CHAI Xiaobing1,ZENG Jianping3,YANG Jiayi3. Experimental study on the effects of aspect ratios on the aerodynamic characteristics of a smooth cylinder[J]. Journal of Vibration and Shock, 2019, 38(14): 195-201

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