柔性附属结构对5:1矩形柱体气动特性的影响  

Effects of flexible accessory structure on aerodynamic characteristics of a 5꞉1 rectangular cylinder

作　　者：尹亚鹏 王汉封[1,2] 李欢[1] 邓国浩 谢祖育 肖海珠[3] YIN Yapeng;WANG Hanfeng;LI Huan;DENG Guohao;XIE Zuyu;XIAO Haizhu(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha 410075,China;China Railway Major Bridge Reconnaissance&Design Institution Co.Ltd.,Wuhan 430056,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075 [3]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《中南大学学报（自然科学版）》2023年第4期1603-1612,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52078505)。

摘　　要：为了研究柔性附属结构对5:1矩形柱体气动特性的影响,采用烟线法对矩形柱体的分离再附流动进行可视化研究。通过改变雷诺数Re、风攻角α等参数,对矩形柱体进行测压试验。研究结果表明:柔性附属结构对矩形柱体绕流产生气动干扰作用,且随着Re增加,干扰作用更加明显;随着Re增加和α发生改变,柔性附属结构拍动形态主要包括稳定变形、尖部轻微摆动、中上部大幅度摆动、整体剧烈拍动、拍动并撞壁共5种;柔性附属结构可降低阻力系数,最大降幅为13.6%;柔性附属结构可降低升力系数,降低幅度与Re有关;矩形柱体受到的扭矩绝对值与单柱体时相比显著减小,最大降幅为98.5%。In order to study the effect of flexible accessory structure on aerodynamic characteristics of a 5꞉1 rectangular cylinder,the smoke-wire method was used to visualize the separation and reattachment flow of rectangular cylinder.The pressure test of rectangular cylinder was carried out by changing the Reynolds number Re and the angle of attackα.The results show that the flexible structure has aerodynamic interference effect on the flow around the rectangular cylinder,and the interference effect becomes more obvious with the increase of Re.With the increase of Re and the change ofα,the flapping patterns of flexible accessory structures mainly include stable deformation,slight swing of tip,large swing of middle and upper part,strong flapping of the whole,flapping and wall collision.The flexible structure can reduce the drag coefficient by 13.6%.The flexible structure can reduce the lift coefficient,which is related to Re.The absolute torque of rectangular cylinder is significantly reduced compared with that of single cylinder,and the maximum reduction is 98.5%.

关 键 词：柔性附属结构 矩形柱体 气动特性 

分 类 号：U270.2[机械工程—车辆工程]