不同攻角三角柱双自由度风致振动响应特性研究  

Two-degrees of Freedom Wind-induced Vibration of Equilateral Triangular Prism Under Different Attack Angles

作　　者：邹群峰 丁林[1,2] 宋天 张力[1,2] ZOU Qunfeng;DING Lin;SONG Tian;ZHANG Li(Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education of China,Chongqing University,Chongqing 400044,China;School of Energy and Power Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]重庆大学能源与动力工程学院,重庆400044

出　　处：《工程热物理学报》2023年第3期677-683,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51776021);重庆市自然科学基金面上项目(No.cstc2020jcyj-msxmX0813);中央高校基本科研业务费(No.2020CDJ-LHZZ-045)。

摘　　要：结构的风致振动现象在自然界和工程应用中极其常见,本文针对等边三角柱风致振动问题,采用二维非稳态数值方法研究了不同来流攻角对振动响应的影响。结果表明,三角柱在低攻角下垂直流向的振幅极低且随折减速度U*的增加变化不大;当攻角α_(0)≥40°时,三角柱垂直流向振幅随U^(*)的增加而上升,可观察到初始分支和上部分支。除α_(0)=10°外,三角柱振动折减频率f_(y)^(*)随U^(*)的增加先缓慢上升(3≤U^(*)≤8),后稳定于1.0附近,并可捕捉到频率锁定现象。α_(0)=40°时,随着U^(*)的增加三角柱尾迹由双列涡街向单列涡街的转变。Wind-induced vibration(WIV)is very common in nature and engineering applications.In this work,the effect of different attack angles on WIV responses of equilateral triangular prism was investigated by two-dimensional unsteady numerical method.The results show that the amplitude of prism in cross-flow direction is extremely low for low attack angles and almost doesn’t change with the rise of the reduced velocity(U^(∗));when α_(0)≥40°,the amplitude in cross-flow direction increases with the rise of U^(∗),the initial branch and the upper branch can be obtained.Except for α_(0)=10°,the reduced frequency(f_(y)^(∗))slowly increases first(3≤U^(∗)≤8)and then stabilizes around 1.0 with the rise of U^(∗),lock-in phenomenon can be observed.When α_(0)=40°,the wake of prism transforms from two parallel vortex streets to single row of vortex street with the rise of U^(∗).

关 键 词：三角柱 风致振动 攻角 双自由度 尾流结构 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程] O323[理学—一般力学与力学基础]