基于风洞试验和数值模拟的双矩形断面涡振气动干扰研究

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摘要采用节段模型风洞试验和CFD数值模拟对宽高比为5∶1的双幅矩形断面涡振气动干扰进行了研究。分析了不同水平间距对双矩形断面竖弯和扭转涡振响应的影响。在水平间距比为1.2时进行了动态压力测试，并分别对竖弯和扭转涡振风速下的脉动风压场进行POD分析。结果表明双矩形断面间存在显著的气动干扰，且一般而言下游断面的涡振响应大于上游断面。前两阶本征模态与双矩形断面涡振相关联，由前两阶本征模态可重构脉动风压场。CFD数值模拟的结果表明双矩形断面的涡振符合“撞击剪切层失稳机制”，且一个周期内上游断面下风向以及下游断面上风向区域的流动变化较为显著。CFD模拟与POD分析的结果相符合，两者相结合可用于分析双矩形断面的涡振现象。

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	马凯
	胡传新
	袁万城
	周志勇
	党新志

关键词 ：风洞试验, 双矩形断面, 涡振, 气动干扰, 本征值正交分解(POD), 计算流体力学(CFD)

Abstract：Here, segment model’s wind tunnel tests and CFD simulation were conducted to investigate aerodynamic interferences in vortex-induced vibration (VIV) of dual-rectangular sections with the aspect ratio of 5. Effects of horizontal spacing on dual-rectangular sections’ vertical bending and torsional VIV responses were analyzed. Dynamic pressure measurements were done during the horizontal spacing ratio being 1.2. POD analysis was conducted for fluctuating wind pressure field under vertical bending and torsional VIV wind velocities, respectively. The results showed that there are significant aerodynamic interferences between dual-rectangular sections, and VIV response of downstream section is larger than that of upstream one in general; the first two POD modes are correlated with VIVs of dual-rectangular sections, and the first two POD modes can be used to reconstruct fluctuating wind pressure fields. CFD simulation results showed that VIV of dual-rectangular sections conforms to "instability mechanism of impact shear layer", and flowing variations are more significant in areas of downwind direction of upstream section and upwind direction of downstream section within one period; CFD simulation results are consistent to those of POD analysis, the former combined with the latter can be used to analyze VIV phenomena of dual-rectangular sections.

Key words： wind tunnel test dual-rectangular section vortex-induced vibration (VIV) aerodynamic interference proper orthogonal decomposition (POD) computational fluid dynamics (CFD)

收稿日期: 2018-05-14 出版日期: 2019-12-28

引用本文:

马凯，胡传新，袁万城，周志勇，党新志. 基于风洞试验和数值模拟的双矩形断面涡振气动干扰研究[J]. 振动与冲击, 2020, 39(1): 157-183.
MA Kai, HU Chuanxin, YUAN Wancheng, ZHOU Zhiyong, DANG Xinzhi. Aerodynamic interferences in vortex-induced vibration of dual-rectangular sections based on wind tunnel tests and numerical simulation. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(1): 157-183.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I1/157

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