不同风向角下方柱气动特性的风洞试验研究  

Wind tunnel test study on aerodynamic characteristics of square cylinder under different wind attack angles

作　　者：刘小兵 吴倩云 孙亚松 LIU Xiaobing;WU Qianyun;SUN Yasong(Wind Engineering Research Center,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]石家庄铁道大学风工程研究中心,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：《建筑结构》2021年第15期94-98,共5页Building Structure

基　　金：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项目(ZD2019118)。

摘　　要：基于刚性模型测压风洞试验,分析了0~45°范围内不同风向角下方柱的气动特性,得到了方柱的平均风压分布、脉动风压分布、平均气动力、脉动气动力、旋涡脱落特性和驰振稳定性随风向角的变化规律。结果表明:方柱的平均阻力系数和平均升力系数随着风向角的增大均先减小后增大,最后趋于平稳,在15°风向角附近取得最小值;方柱的脉动阻力系数基本不随风向角的变化而变化,脉动升力系数在风向角由5°增大到10°时急剧减小;方柱的斯托罗哈数随着风向角的增大呈小幅波动,在5°和15°风向角附近分别取得极小值和极大值;0~10°为方柱的驰振不稳定风向角范围。A rigid model pressure-measured wind tunnel test was carried out to analyze the aerodynamic characteristics of a square cylinder at different wind attack angles ranging from 0°to 45°.The changing rule of time-averaged wind pressure distribution,fluctuating wind pressure distribution,time-averaged aerodynamic force,fluctuating aerodynamic force,vortex shedding characteristic and galloping stability of a square cylinder with wind attack angles was displayed.The results show that time-averaged drag force coefficient and lift force coefficient decrease firstly,then increase,and become constant at last with increase of wind attack angle.The wind attack angle corresponding to minimum value is 15°.Fluctuating drag force coefficient change little with increase of wind attack angle.Fluctuating lift force coefficient decreases dramatically when wind attack angle changes from 5°to 10°.St changes slightly with increase of wind attack angle.The wind attack angle corresponding to maximum value and minimum value are 5°and 15°,respectively.Unstable wind attack angle of galloping ranges from 0°to 10°.

关 键 词：方柱 气动特性 风向角 风洞试验 

分 类 号：TU973[建筑科学—结构工程]