亚临界雷诺数下线形布置三圆柱的平均气动力特性  

Mean aerodynamic force characteristics of three circular cylinders arranged inline at a subcritical Reynolds number

作　　者：刘小兵[1,2,3] 姜会民 王世博 刘夕强 杨群 LIU Xiaobing;JIANG Huimin;WANG Shibo;LIU Xiqiang;YANG Qun(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [2]河北省风工程和风能利用工程技术创新中心,河北石家庄050043 [3]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《建筑结构学报》2023年第3期185-197,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(52078313,52008273);河北省自然科学基金项目(E2020210083);省部共建交通工程结构力学行为与系统安全国家重点实验室自主课题(ZZ2020-14)。

摘　　要：为了给线形布置三圆柱结构的平均风荷载取值提供参考,通过刚性模型测压风洞试验研究了线形布置三圆柱在不同风向角和间距比下的平均气动力特性,并与单圆柱的结果进行对比分析。试验雷诺数为6.4×10^(4),风向角α和间距比L/D(相邻圆柱中心距与圆柱直径之比)的范围分别为0°~90°和1.2~4.0。研究结果表明:线形布置三圆柱的平均气动力特性可按间距比大致分为极小间距比(1.2≤L/D<1.4)、小间距比(1.4≤L/D<2.5)、中等间距比(2.5≤L/D<3.5)和大间距比(3.5≤L/D≤4.0)四类;三圆柱的平均阻力系数在极小间距比和小间距比时主要表现为减小效应,中等间距比时在α<60°时表现为减小效应,在α>60°时表现为一定的放大效应,大间距比时下游两圆柱在α≤30°时表现为减小效应;三圆柱的平均升力系数在一定风向角范围内表现为非零值,该风向角范围与间距比密切相关。To provide a reference value of the mean wind load for the three-cylinder structure arranged inline, the mean aerodynamic force characteristics of three circular cylinders arranged inline at different incidence angles and spacing ratios were studied via pressure-measured rigid model wind tunnel tests. The results were compared with those of a single cylinder. The Reynolds number is 6.4×10^(4), and the range of incidence angle α and spacing ratio L/D(the ratio of the center distance between adjacent cylinders to the diameter of the cylinder) are 0°-90° and 1.2-4.0, respectively. The results show that according to the spacing ratios, the mean aerodynamic force characteristics of three circular cylinders arranged inline can be roughly divided into four types: minimum spacing ratio(1.2≤L/D<1.4), small spacing ratio(1.4≤L/D<2.5), medium spacing ratio(2.5≤L/D<3.5), and large spacing ratio(3.5≤L/D≤4.0). At the minimum and small spacing ratios, the mean drag coefficient of three cylinders mainly experiences a decreasing effect. At the medium spacing ratio, the mean drag coefficient shows a decreasing effect when α<60° and an increasing effect when α≥60°. At the large spacing ratio, the mean drag coefficient for the two downstream cylinders experiences a decreasing effect when α≤30°. The mean lift coefficient of the three cylinders shows non-zero values in a certain range of incidence angles, which is closely related to the spacing ratio.

关 键 词：线形布置三圆柱 风向角 间距比 风洞试验 平均气动力系数 平均风压系数 

分 类 号：TU311.3[建筑科学—结构工程] TU317.1