摘要
多钝体流致振动是涉及流体工程安全性的重要问题,为了探究多钝体流致振动的相互影响,针对不同间隙距离串列弹性支撑双方柱流致振动进行研究,方柱间距变化范围为2-6倍方柱边长D,分析折减速度在4.04-13.46时双方柱振幅及频率响应特性,并与串列被动控制双圆柱流致振动和相关方柱实验进行比较。研究结果表明,当方柱间距大于4 D时,上游方柱振动响应与单方柱实验结果相似,受下游方柱的影响较弱;双方柱流致振动在间距为4 D时得到加强,上下游方柱达到最大振幅,分别为1.06 D和1.10 D;当间距小于4 D时,双方柱流致振动减弱,与单方柱实验结果相比振幅减小;间距对双方柱的振动频率没有表现出明显影响。在折减速度为8.00时,随间距增大,上游方柱能在双方柱间隙内形成完整脱体旋涡,下游方柱的尾涡模态经历了2S(双单涡模态)、P+2S(涡对+双单涡组合模态)、2S的转变过程。
The Flow-induced Motion (FIM) of multi-bluff bodies is an important issue involved in fluid engineering safety. With the rapid development of fluid engineering in recent years, the FIM of multi-bluff bodies attracts a lot of attention, and there are still many problems need to be further studied. In order to release the interaction between the FIMs of the multi-bluff bodies, numerical studies of two elastic supported square cylinders in tandem with different gap spaces are conducted at reduced velocity range from 4.04 to 13.46 in this paper. The gap spaces change from 2 D to 6 D , where D is the side length of the square cylinder. The amplitude and frequency responses of the FIM for two square cylinders are analyzed, and compared with the results of two Passive-Turbulence-Controlled circular cylinders and the relevant experimental tests of square cylinder. The results show that the downstream square cylinder has a weak influence on the upstream one, and the amplitude response of the upstream square cylinder is similar to the experimental result of a single square cylinder when spacing is greater than 4 D . The oscillations of two square cylinders are enhanced when gap space is 4 D , and the maximum amplitudes reach 1.06 D and 1.10 D for the upstream cylinder and the downstream cylinder, respectively. When spacing is smaller than 4 D , the FIM of two square cylinders is weakened and their amplitudes are lower than the experimental results. Otherwise, the spacing has no significant effect on the frequency of two square cylinders. Under the same conditions, the amplitudes of two square cylinders are lower than that of two circular cylinders. Besides, when the reduce velocity is 8.00, as the spacing increases, no vortex formed behind the upstream square cylinder turns into a complete vortex shedding behind the upstream square cylinder between two square cylinders, and the vortex mode of the downstream square cylinder changes from 2S(two single vortices) to P+2S(a pair and two single vortices) and then to 2S. At the s
作者
丁林
叶倩云
王海博
熊翊君
张力
DING Lin;YE Qian-yun;WANG Hai-bo;XIONG Yi-jun;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)
出处
《振动工程学报》
EI
CSCD
北大核心
2019年第2期331-339,共9页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(51776021
51406018)
重庆市基础科学与前沿技术研究专项项目(cstc2016jcyjA0255)
中央高校基本科研业务费资助(106112016CDJXY145505)
关键词
流致振动
双方柱
串列排布
间隙距离
旋涡脱落
flow-induced motion
two square cylinders
tandem arrangement
gap space
vortex shedding
