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| Tests for aerodynamic characteristics of tandem multi-square columns |
| YANG Qun1,2,3, WU Qianyun3, JIANG Huimin3, TAO Tao3, LIU Xiaobing1,2,3 |
1.State Key Lab of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2.Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China;
3.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China |
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Abstract In order to study aerodynamic characteristics of tandem multi-square columns, wind pressure coefficient, lift and drag coefficients, and Strouhal number of tandem 2 square columns and tandem 3 square columns with different spacing ratios were studied by using the rigid model pressure measurement wind tunnel test method when Reynolds number was 3.2×104 and the spacing ratio was in the range of 1.2-8.The results showed that the critical spacing ratio of tandem 2 square columns is 3-3.5, and tandem 3 square columns has two critical spacing ratios of 2.5-3 and 3.5-4.Through comparing tandem 2 square columns and tandem 3 square column, it was shown that adding a square column downstream of tandem 2 square columns can significantly affect the aerodynamic characteristics of the original tandem 2 square columns, the absolute values of its average drag coefficient, pulsating lift coefficient and Strouhal number all decrease when the spacing ratio L/D≤3.5, but this reduction effect weakens when the spacing ratio L/D≥4, the distribution of wind pressure is similar to that of the original tandem 2 square columns, but their values are different, their difference is the most obvious when the spacing ratio is 3.5; the aerodynamic force and wind pressure coefficient of the added square column increase suddenly when the spacing ratio is 2.5-3, and vice versa when the spacing ratio is 3.5-4.
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Received: 15 July 2020
Published: 15 May 2021
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