并列三方柱气动特性的试验研究  

Experimental study on the aerodynamic characteristics of three side-by-side square cylinders

作　　者：刘小兵[1,2,3] 于文文 吴倩云 陶韬 杨群 LIU Xiaobing;YU Wenwen;WU Qianyun;TAO Tao;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,石家庄050043 [2]河北省风工程和风能利用工程技术创新中心,石家庄050043 [3]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《振动与冲击》2021年第22期75-81,97,共8页Journal of Vibration and Shock

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(E2018210105,E2020210083);河北省高等学校科学技术研究项目(ZD2019118);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);河北省大型基础设施防灾减灾协同创新中心资助项目。

摘　　要：为了给实际土木工程中并列三方柱结构的抗风设计提供参考,采用刚性模型测压风洞试验的方法,测试并研究了并列三方柱的升阻力系数、风压系数及斯托罗哈数随间距的变化规律。三方柱相邻两柱的间距与单方柱边长之比L/D的变化范围为1.2~8.0。研究结果表明:当1.2≤L/D≤2.0时,由于偏流现象的存在,两侧方柱的气动力不等,中间方柱会受到非0的平均升力作用;当L/D由2.0增加到2.5时,两侧方柱的脉动阻力会出现突升现象;当L/D由3.0增加到3.5时,中间方柱的脉动阻力和三方柱的脉动升力会出现突升现象。并列三方柱的旋涡脱落在1.2≤L/D≤2.0时受到了明显的抑制,在L/D≥2.5时比较明显,且对应的斯托罗哈数大致相等。In order to provide reference to the wind resistance design of three side-by-side square cylinders in practical civil engineering,pressure measurement wind tunnel tests on rigid models were adopted.The variation of lift and drag coefficient,wind pressure coefficient and Strouhal number of the three side-by-side square cylinders with spacings were tested and studied.The ratio L/D of the distance between two adjacent cylinders to the side length of single cylinder varied from 1.2 to 8.0.The results show that when 1.2≤L/D≤2.0,due to the existence of bias flow,the aerodynamic forces on both sides of the square cylinders are unequal,and the middle cylinder will be subjected to an average lift of non-zero.When L/D increases from 2.0 to 2.5,the fluctuating drag forces on both sides of the square cylinders will suddenly rise.When L/D increases from 3.0 to 3.5,the fluctuating drag force on the middle square cylinder and the fluctuating lift forces on the three square cylinders will suddenly rise.The vortex shedding of the three side-by-side square cylinders is obviously suppressed when 1.2≤L/D≤2.0,while it is more obvious when L/D≥2.5,and the corresponding strouhal number is roughly identical.

关 键 词：并列三方柱 风洞试验 升阻力系数 斯托罗哈数 风压分布 

分 类 号：TU973[建筑科学—结构工程]