振动与冲击第42卷第14期JOURNALOFVIBRATIONANDSHOCKVol.42No.142023均匀流场中串列阶梯圆柱流致振动试验研究及春宁'，张妍"，殷彤"，赵亚伟"，袁德奎²，许栋'（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）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。关键词：串列圆柱；阶梯圆柱；流致振动；间距比中图分类号：P751;TB531Experimentalstudyontheflow-inducedvibrationoftwotandemJIChunning',ZHANGYan',YINTong',ZHAOYawei',YUANDekui?,XUDong(1.StateKeyLabofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin300350,China;2.SchoolofMechanicalEngineering,TianjinUniversity,Tianjin300350,China)Abstract:Theflow-inducedvibrationoftwotandemsteppedcylindersinuniformflowwasinvestigatedexperimentallyintherangeofReynoldsnumberfrom570to5000,withthecoverageratioofthesteppedcylindersbeingR=50%andthespacingratiobeingD/d=1.5.Intheexperiments,theupstreamcylinderwasfixedandthedownstreamcylindervibratedfreelyinthecross-flowdirection.Fourspacingratiosofs/D*=2,4,8and16wereinvestigatedandthecorrespondingin-phaseandout-of-phasearrangementsoftheupstreamanddownstreamcylinderswereconsidered.Theresultsshowthatthespacingratiohasasignificanteffectontheinteractionbetweenthetandemsteppedcylinders,andachangeinspacingratioaltersthegapflowpatternbetweenthecylinderswhichleadstothedifferentvibrationcharacteristicsofthedownstreamcylinder.Fortheout-of-phasearrangementofthetandemcylinders,thedownstreamcylinderundergoeswake-inducedvibrationwhenthespacingratioissmallandthereducedvelocityishigh.Thatis...
