2023.№3大电机技术空化诱导的轴流式水轮机转轮径向振动特性研究门羿1,朱国俊1,冯建军1,王晓航2,3,张乐福1(1.西安理工大学,西安710048;2.哈尔滨电机厂有限责任公司,哈尔滨150040;3.水力发电设备全国重点实验室(哈尔滨大电机研究所),哈尔滨150040)[摘要]转轮的径向振动特性对水轮机转子系统的稳定性至关重要。为了研究空化对轴流式水轮机转轮径向振动特性的影响规律,本文首先搭建了包含激光测振仪(LaserDopplerVibrometer,LDV)的非接触式振动测试系统,并结合高速摄影系统获得了不同空化状态下的转轮内部流场图像以及转轮径向振动信号。然后对转轮内部流动图像及振动信号进行了综合分析,结果表明:从无空化到空化初生阶段,空化系数的降低对转轮径向振动基本没有影响;空化初生以后,转轮径向振动的幅值会随着空化程度的加剧而急剧上升。转轮内部空化流动形态的转变是转轮径向振动频域特性改变的根源。从空化初生到完全空化阶段,转轮径向振动的能量会出现向低频区域迁移的趋势,增加机组共振的风险。本文的研究对轴流式水轮机稳定运行以及经济性具有重要意义。[关键词]轴流式转轮;空化;径向振动;时频分析;多重信号分类[中图分类号]TK730.3+23[文献标志码]A[文章编号]1000-3983(2023)03-0051-07StudyontheRadialVibrationofKaplanTurbineRunnerInducedbyCavitationMENYi1,ZHUGuojun1,FENGJianjun1,WANGXiaohang2,3,ZHANGLefu1(1.Xi'anUniversityofTechnology,Xi'an710048,China;2.HarbinElectricMachineryCo.,Ltd.,Harbin150040,China;3.StateKeyLaboratoryofHydro-powerEquipment(HarbinInstituteofLargeElectricalMachinery),Harbin150040,China)Abstract:Theradialvibrationcharacteristicsoftherunnerareveryimportanttothestabilityoftheturbinerotorsystem.InordertostudytheinfluenceofthecavitationontheradialvibrationcharacteristicsoftherunnerofKaplanturbine,anon-contactvibrationtestingsystemincludingLaserDopplerVibrometer(LDV)isfirstlyestablished.Thentheimagesofflowinrunnerandradialvibrationsignalsofrunnersunderdifferentcavitationconditionsareobtainedbycombininghigh-speedflowvisualizationsystemwiththenon-contactvibrationtestingsystem.Finally,theflowimagesandvibrationsignalsoftherunnerarecomprehensivelyanalyzed.Theresultsindicatethatthereductionofca...