C型环对细长圆柱减阻抑振效果的试验研究  

Experimental study on effect of C-ring on mitigation of drag and vibration for a circular cylinder

作　　者：马文勇 杜展 靖洪淼 张晓斌 MA Wen-yong;DU Zhan;JING Hong-miao;ZHANG Xiao-bin(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology for Hebei Province,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]河北省风工程和风能利用工程技术创新中心,河北石家庄050043

出　　处：《振动工程学报》2023年第4期1094-1100,共7页Journal of Vibration Engineering

基　　金：河北省杰出青年科学基金资助项目(E2021210053);河北省青年科学基金资助项目(E2021210063)。

摘　　要：长细比较大的圆柱结构易发生涡激振动从而引发结构安全问题,而阻力小的气动抑振措施是解决该问题的理想手段之一。为此,开展了一种C型减阻抑振环风洞试验,研究了不同直径和圆心角的C型环对不同雷诺数下的圆柱气动力的影响,并通过圆柱表面的风压分布揭示了C型环的减阻抑振机理。研究结果表明,通过减弱背风面的负压C型环可以有效减小亚临界雷诺数区圆柱的阻力,而且通过对尾流的干扰可有效抑制旋涡脱落。Slender cylindrical structures are often subject to vortex-induced-vibrations,which can lead to structural safety problems.The aerodynamic suppression measure with small drag is one of the ideal approaches to solve this issue.To this end,wind tunnel test of the cylinder with a new type of C-ring is carried out in this paper.Influence of the C-ring with different diameters and central angles on the aerodynamic forces of the cylinder under different Reynolds number is comprehensively investigated.Meanwhile,mechanism of the drag reduction and vibration suppression of the C-ring is analyzed and revealed according to wind pressure distri⁃bution on the cylinder surface.The results indicate that drag of the cylinder in the subcritical Reynolds number range can be effec⁃tively reduced by weakening negative pressure on the leeward,and the wake vortex shedding can be obviously restrained by inter⁃ference of the wake.

关 键 词：圆柱 风洞试验 C型环 气动力 旋涡脱落 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]