串列双方柱干扰效应流动机理研究

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摘要为了研究建筑群体周围的流场结构，减小工程设计中由于干扰效应造成的损失，利用粒子图像测速(PIV)结合数值模拟，研究在较大雷诺数及不同间隙工况下，双方柱流场受干扰时的流动特性及流场空间结构。分析升阻力系数、涡脱频率、斯特劳哈尔数等流场特征参数，探究不同间隙对串列双方柱的影响。当Re=3.42×104时，存在临界间隙比G=4使串列双方柱流场结构发生突变，试验观察到流场中出现双稳态现象；当G<4时，下风向方柱平均阻力系数为负值，小于单方柱情况下的阻力，屏蔽效应明显，上风向方柱后方涡脱落被抑制，平均阻力系数出现了明显的降幅，最大降幅约达10%；当G>4时，上下方柱均有涡旋脱落。该结果对于工程应用具有参考意义。

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	樊晓羽1
	秦浩1
	商敬淼2
	胡帅1

关键词 ：串列方柱, 干扰效应, 粒子图像测速（PIV）, 雷诺数, 风洞试验, 数值模拟

Abstract：The present paper is aimed at studying the flow field around the building group and reducing the loss caused by the interference effect in the engineering.The particle image velocimetry (PIV) and numerical simulation were used to study the flow characteristics and spatial structure of the flow field when the flow field of two square cylinders were disturbed under large Reynolds number and different spacing conditions.Characteristic parameters of flow field, such as lift and drag coefficient, vortex shedding frequency and Strauhal number, were analyzed to study the effects of different spacing on the two cylinders in a tandem arrangement.When Re=3.42×104, there is a critical spacing ratio of G=4, causing a sudden change in the flow field structure of two cylinders in the tandem arrangement.A bistable phenomenon appears in the flow field.When G<4, the average drag coefficient of the downstream square cylinder is negative, which is smaller than that of the single cylinder.The shielding effect is obvious at this point.The vortex shedding behind the upstream square cylinder was suppressed, and the average drag coefficient has a significant decrease, with a maximum drop of around 10%.When G>4, both the upstream and downstream square cylinders have seen vortexes shedding.Thse results can serve as references for engineering application.

Key words： two square cylinders in tandem arrangement interference effect particle image velocimetry（PIV） Reynolds number wind tunnel experiment numerical simulation

收稿日期: 2018-10-16 出版日期: 2020-04-15

引用本文:

樊晓羽1，秦浩1，商敬淼2，胡帅1. 串列双方柱干扰效应流动机理研究[J]. 振动与冲击, 2020, 39(8): 230-238.
FAN Xiaoyu1, QIN Hao1, SHANG Jingmiao2, HU Shuai1. Flow mechanism investigation on interference effect of two square cylinders in tandem arrangement. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(8): 230-238.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I8/230

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