并列三方柱气动特性的试验研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (22) : 75-81.

论文

并列三方柱气动特性的试验研究

刘小兵1,2,3，于文文3，吴倩云3，陶韬3，杨群1,2,3

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

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

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文章历史 +

摘要

为了给实际土木工程中并列三方柱结构的抗风设计提供参考，采用刚性模型测压风洞试验的方法，测试并研究了并列三方柱的升阻力系数、风压系数及斯托罗哈数随间距的变化规律。三方柱相邻两柱的间距与单方柱边长之比L/D的变化范围为1.2~8。研究结果表明，当1.2≤L/D≤2时，由于偏流现象的存在，两侧方柱的气动力不等，中间方柱会受到非0的平均升力作用。当L/D由2增加到2.5时，两侧方柱的脉动阻力会出现突升现象。当L/D由3增加到3.5时，中间方柱的脉动阻力和三方柱的脉动升力会出现突升现象。并列三方柱的旋涡脱落在1.2≤L/D≤2时受到了明显的抑制，在L/D≥2.5时比较明显，且对应的斯托罗哈数大致相等。

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.

导出引用

刘小兵1,2,3，于文文3，吴倩云3，陶韬3，杨群1,2,3. 并列三方柱气动特性的试验研究[J]. 振动与冲击, 2021, 40(22): 75-81

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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