(1 石家庄铁道大学土木工程学院， 石家庄 050043；2 石家庄铁道大学大型结构健康诊断与控制研究所， 石家庄 050043；3 河北省大型结构健康诊断与控制重点实验室， 石家庄 050043）

［摘要］通过刚性模型测压风洞试验对串列双方柱在16个不同间距时的绕流进行了详细研究。双方柱的中心距L与单个方柱横断面的边长D之比L/D的变化范围为1-2～12-0。试验结果发现，串列双方柱的临界间距范围为3-5≤(L/D)cr≤4-0。在临界间距范围内，串列双方柱的绕流具有双稳态特征，同一间距下，上下游方柱均会出现两组明显不同的压力分布与气动力。通过引入干扰因子，定量地讨论了串列双方柱的脉动压力分布、脉动阻力和脉动升力随L/D的变化规律。

［关键词］串列双方柱； 脉动压力分布； 脉动阻力； 脉动升力； 风洞试验

中图分类号：TU311-3文献标识码：A文章编号：1002-848X(2020)01-0140-05

Study on fluctuating pressure distribution and aerodynamic force of flows around two square cylinders in tandem arrangement

Yang Qun1, Zhao Huitao1, Liu Xiaobing1,2,3， Liu Qingkuan1,2,3

(1 School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043， China;2 Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043， China;3 Hebei Province Key Lab of Structural Health Monitoring and Control, Shijiazhuang 050043， China)

Abstract:Flows around two square cylinders in tandem arrangement under 16 different spacings were investigated in detail through pressure-measured rigid model wind tunnel tests. The spacing ratio L/D is ranging from 1-2 to 12-0, where D is side length of single square cylinder and L is distance between centers of two square cylinders. The research results show that the critical spacing ratio L/D of two square cylinders in tandem arrangement is ranging from 3-5 to 4-0. In the critical spacing ratio, the flow is bistable. Two groups of different pressure distributions and aerodynamic forces appear in two square cylinders with the same spacing ratio. The variations of fluctuating pressure distribution, fluctuating drag force and fluctuating lift force with L/D are discussed quantitatively by the introduction of interference factor.

Keywords:two square cylinders in tandem arrangement; fluctuating pressure distribution; fluctuating drag force; fluctuating lift force; wind tunnel test

*河北省自然科学基金项目(E2018210105)，河北省高等学校科学技术研究重点项目（ZD2019118），河北省大型基础设施防灾减灾协同创新中心资助项目。

作者简介：杨群，博士研究生，讲师，Email: quny123@126.com。