为研究串列多方柱的气动特性，采用刚性模型测压风洞试验的方法研究了雷诺数为3.2×104时,间距比在1.2～8范围内，串列双方柱和串列三方柱在不同间距比下的风压系数、升阻力系数以及斯托罗哈数。结果表明：串列双方柱的临界间距比在3～3.5之间，串列三方柱存在两个临界间距比，分别在2.5～3和3.5～4。通过串列双方柱和三方柱的对比可以看到：在双方柱下游增加一个方柱会显著影响其气动特性，平均阻力系数的绝对值、脉动升力系数和斯托罗哈数均在间距比L/D≤3.5时减小，但在间距比L/D≥4时这种减小效果减弱。风压分布与原双方柱相似，但数值有所不同，在间距比为3.5时差异最为明显。位于双方柱下游的方柱其气动力及风压系数在间距比为2.5～3时突然增大，在间距比为3.5～4时则相反。
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.
关键词
串列多方柱 /
气动特性 /
风洞试验 /
风压分布 /
升阻力系数 /
旋涡脱落频率
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Key words
tandem multi-square columns /
aerodynamic characteristics /
wind tunnel test /
wind pressure distribution /
lift and drag coefficients /
vortex shedding frequency
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参考文献
［1］SAKAMOTO H, HANIU H, OBATA Y.Fluctuating forces acting on two square prisms in a tandem arrangement［J］.Journal of Wind Engineering and Industrial Aerodynamics, 1987, 26(1): 85-103.
［2］陈素琴, 黄自萍, 沈剑华, 等.两串列方柱绕流的干扰数值研究［J］.同济大学学报(自然科学版), 2001,29(3): 320-325.
CHEN Suqin, HUANG Ziping, SHEN Jianhua, et al.Numerical computation of the flow around two square cylinders in tandem arrangement［J］.Journal of Tongji University(Natural Science), 2001,29(3): 320-325.
［3］杜晓庆, 许汉林, 马文勇, 等.串列双方柱气动干扰效应试验研究［J］.建筑结构学报, 2019,40(11): 27-34.
DU Xiaoqing, XU Hanlin, MA Wenyong, et al.Experimental study on aerodynamic interference effect of two square cylinders in a tandem arrangement［J］.Journal of Building Structures, 2019,40(11): 27-34.
［4］KIM M K, KIM D K, YOON S H, et al.Measurements of the flow fields around two square cylinders in a tandem arrangement［J］.Journal of Mechanical Science and Technology, 2008, 22(2): 397-407.
［5］李雪健, 苏中地.绕串列方柱流动的三维大涡仿真［J］.计算机仿真, 2014,31(6): 238-242.
LI Xuejian, SU Zhongdi.Large eddy simulation of three-dimensional flow past two square cylinders in tandem［J］.Computer Integrated Manufacturing Systems, 2014,31(6): 238-242.
［6］李聪洲, 张新曙, 胡晓峰, 等.高雷诺数下多柱绕流特性研究［J］.力学学报, 2018, 50(2): 233-243.
LI Congzhou, ZHANG Xinshu, HU Xiaofeng, et al.The study of flow past multiple cylinders at high Reynolds numbers［J］.Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(2): 233-243.
［7］LIU C H, CHEN J M.Observations of hysteresis in flow around two square cylinders in a tandem arrangement［J］.Journal of Wind Engineering and Industrial Aerodynamics, 2002, 90(9): 1019-1050.
［8］韩宁, 顾明.两串列方柱局部脉动风压干扰研究:第1部分迎风面效应［J］.振动与冲击, 2009,28(12): 188-192.
HAN Ning, GU Ming.Interference effects on local fluctuating pressure on two square tall buildings in tandem arrangement: part 1, wind ward side effects［J］.Journal of Vibration and Shock, 2009,28(12): 188-192.
［9］MORE B S, DUTTA S, CHAUHAN M K, et al.Experimental investigation of flow field behind two tandem square cylinders with oscillating upstream cylinder［J］.Experimental Thermal and Fluid Science,2015,68: 339-358.
［10］SAYERS A T.Steady-state pressure and force coefficients for groups of three equispaced square cylinders situated in a cross flow［J］.Journal of Wind Engineering and Industrial Aerodynamics,1991,37(2):197-208.
［11］ISLAMA S U, ABBASI W S, YING Z C.Transitions in the unsteady wakes and aerodynamic characteristics of the flow past three square cylinders aligned inline［J］.Aerospace Science and Technology, 2016, 50: 96-111.
［12］郑钦敏.低雷诺数下三方柱绕流机理研究［D］.哈尔滨:哈尔滨工业大学, 2018.
［13］ABBASI W S, ISLAM S U, FAIZ U, et al.Numerical investigation of transitions in flow states and variation in aerodynamic forces for flow around square cylinders arranged inline［J］.Chinese Journal of Aeronautics, 2018,31(11): 2111-2123.
［14］SOHANKAR A.A numerical investigation of the flow over a pair of identical square cylinders in a tandem arrangement［J］.International Journal for Numerical Methods in Fluids, 2012, 70(10): 1244-1257.
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