| 引用本文: | 杜晓庆,顾李敏,吴葛菲,王玉梁,孙雅慧.错列双圆柱的脉动升力特性及其流场机理[J].哈尔滨工业大学学报,2020,52(8):62.DOI:10.11918/201904102 |
| DU Xiaoqing,GU Limin,WU Gefei,WANG Yuliang,SUN Yahui.Fluctuating lift and flow field mechanisms of two staggered circular cylinders[J].Journal of Harbin Institute of Technology,2020,52(8):62.DOI:10.11918/201904102 |
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| 错列双圆柱的脉动升力特性及其流场机理 |
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杜晓庆1,2,顾李敏1,吴葛菲1,王玉梁1,孙雅慧1
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(1.上海大学 土木工程系,上海 200444;2.上海大学 风工程和气动控制研究中心,上海 200444)
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| 摘要: |
| 受到上游圆柱尾流作用,下游圆柱在小风向角下易发生尾流激振现象,脉动升力与尾流激振联系紧密,但以往针对脉动升力特性的研究较少,其流场作用机理尚未澄清.针对间距比为P/D=1.5~4的错列双圆柱,采用大涡模拟方法,在高亚临界雷诺数下(Re=1.4×105),重点研究小风向角下（β=0°~30°）圆柱的脉动升力和流场结构之间的内在关系,基于流场特征讨论了上、下游圆柱之间的干扰机理.研究结果表明:在小风向角范围内,上、下游圆柱的脉动升力和流场特性变化剧烈,双圆柱会经历尾流干扰、剪切层干扰、邻近干扰、旋涡撞击及涡的相互作用五种干扰流态；在尾流干扰以及剪切层干扰流态下,下游圆柱的脉动升力远小于单圆柱；在邻近干扰流态下,上、下游圆柱相互间干扰较弱,下游圆柱的脉动升力接近于单圆柱；而在旋涡撞击流态和涡的相互作用流态下,下游圆柱的脉动升力则大于单圆柱,上游圆柱的尾流旋涡对下游圆柱的撞击或者与下游圆柱旋涡的相互作用会导致下游圆柱的脉动升力急剧增加. |
| 关键词: 错列双圆柱 大涡模拟 高雷诺数 脉动升力 流场机理 |
| DOI：10.11918/201904102 |
| 分类号:TU311 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51578330) |
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| Fluctuating lift and flow field mechanisms of two staggered circular cylinders |
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DU Xiaoqing1,2,GU Limin1,WU Gefei1,WANG Yuliang1,SUN Yahui1
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(1.Department of Civil Engineering, Shanghai University, Shanghai 200444, China; 2.Wind Engineering and Aerodynamic Flow Control Research Center, Shanghai University, Shanghai 200444, China)
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| Abstract: |
| Influenced by the wake flow of upstream cylinder, the downstream cylinder is prone to wake-induced vibration at small wind angles. Although fluctuating lift is closely related to wake-induced vibration, the characteristics of fluctuating lift are less investigated, and the flow field mechanisms are not yet clear. For two staggered circular cylinders with center-to-center pitch ratio P/D of 1.5-4, by using the large eddy simulation (LES) method, the intrinsic relationships between the fluctuating lift of the cylinders and the flow fields were studied at small wind angles (β=0°-30°) with a high Reynolds number of Re=1.4×105. The interference mechanisms between the two cylinders were explored based on the flow field mechanics. Results show that the fluctuating lift of the cylinders and the flow field mechanisms experienced significant changes at small wind angles, and there were five different interference flow patterns, namely, wake interference, shear layer interference, proximity interference, interaction between vortex and cylinder, and interaction between vortex and vortex. Under wake interference and shear layer interference, the fluctuating lift of the downstream cylinder was much smaller than that of a single cylinder. Under proximity interference, the interaction between the two cylinders was weak, and the fluctuating lift of the downstream cylinder was close to that of a single cylinder. For the interaction between vortex and cylinder and the interaction between vortex and vortex, the fluctuating lift of the downstream cylinder was higher than that of a single cylinder, and the wake vortex impinging of the upstream cylinder on the downstream cylinder or the interaction with the downstream cylinder led to the rapid increase of the fluctuating lift of the downstream cylinder. |
| Key words: two staggered circular cylinders large eddy simulation (LES) high Reynolds number fluctuating lift flow field mechanism |
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