Experimental study on the aerodynamic characteristics of three side-by-side square cylinders

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 75-81.

LIU Xiaobing1,2,3，YU Wenwen3，WU Qianyun3，TAO Tao3，YANG Qun1,2,3

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Abstract

In order to provide reference for the wind resistance design of three side-by-side square cylinders in practical civil engineering, the wind pressure measured wind tunnel test on rigid models was adopted. The variation of lift and drag coefficient, wind pressure coefficient and Strouhal number of three side-by-side square cylinders with spacings were tested and studied. The ratio L/D of the distance between two adjacent cylinders of three square cylinders to the side length of single cylinder varies from 1.2 to 8. The results show that when 1.2≤L/D≤2, due to the existence of bias flow, the aerodynamic forces of the square cylinders on both sides are unequal, and the middle cylinder will be subjected to an average lift of non-zero. When L/D increases from 2 to 2.5, the fluctuating drag forces of the square cylinders on both sides will suddenly rise. When L/D increases from 3 to 3.5, the fluctuating drag force of the middle square cylinder and the fluctuating lift forces of the three square cylinders will suddenly rise. The vortex shedding of the three side-by-side square cylinders is obviously suppressed when 1.2≤L/D≤2, while more obvious when L/D≥2.5, corresponding to roughly equal Strouhal number.

Key words

three side-by-side square cylinders / wind tunnel test / lift and drag coefficient / Strouhal number / wind pressure distribution

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LIU Xiaobing1,2,3，YU Wenwen3，WU Qianyun3，TAO Tao3，YANG Qun1,2,3. Experimental study on the aerodynamic characteristics of three side-by-side square cylinders[J]. Journal of Vibration and Shock, 2021, 40(22): 75-81

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