均匀流场中串列阶梯圆柱流致振动试验研究  

Experimental study on the flow-induced vibration of two tandem stepped cylinders in uniform flow

作　　者：及春宁[1] 张妍[1] 殷彤 赵亚伟 袁德奎[2] 许栋[1] JI Chunning;ZHANG Yan;YIN Tong;ZHAO Yawei;YUAN Dekui;XU Dong(State Key Lab of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;School of Mechanical Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300350 [2]天津大学机械工程学院,天津300350

出　　处：《振动与冲击》2023年第14期278-286,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51779172,51579175)。

摘　　要：采用试验方法研究了均匀流场中雷诺数570~5000内串列阶梯圆柱的流致振动现象,阶梯圆柱的覆盖率为R=50%,直径比为D/d=1.5。试验过程中,上游圆柱固定,下游圆柱可沿横流向自由振动。考虑了s/D=2,4,8,16四种间距比和上、下游阶梯圆柱同相布置和反相布置两种情况。结果表明:间距比对于串列阶梯圆柱间的相互作用有着明显的影响,间距比的变化会改变柱间流动模式,导致下游圆柱的振动特性发生改变;对于反相布置,在小间隙比和高折合流速的条件下,下游阶梯圆柱发生尾流驰振,振幅随着折合流速的增加而显著增加;而当间距比s/D≥8后,外形相位的影响则可以忽略。The flow-induced vibration of two tandem stepped cylinders in uniform flow was investigated experimentally in the range of Reynolds number from 570 to 5000,with the coverage ratio of the stepped cylinders being R=50%and the spacing ratio being D/d=1.5.In the experiments,the upstream cylinder was fixed and the downstream cylinder vibrated freely in the cross-flow direction.Four spacing ratios of s/D=2,4,8 and 16 were investigated and the corresponding in-phase and out-of-phase arrangements of the upstream and downstream cylinders were considered.The results show that the spacing ratio has a significant effect on the interaction between the tandem stepped cylinders,and a change in spacing ratio alters the gap flow pattern between the cylinders which leads to the different vibration characteristics of the downstream cylinder.For the out-of-phase arrangement of the tandem cylinders,the downstream cylinder undergoes wake-induced vibration when the spacing ratio is small and the reduced velocity is high.That is,the amplitude increases significantly with the increasing of the reduced velocity.However,when the spacing ratio s/D≥8,the influence of the geometry shape phase is negligible.

关 键 词：串列圆柱 阶梯圆柱 流致振动 间距比 

分 类 号：P751[交通运输工程—港口、海岸及近海工程] TB531[天文地球—海洋科学]