空化对尾水管区域驼峰特性影响研究李琪飞12,谢耕达",李占勇1，韩天丁1,刘思琪3（1.兰州理工大学能源与动力工程学院,甘肃兰州730050；2.甘肃省流体机械及系统重点实验室，甘肃兰州730050；3.西华大学流体及动力机械教育部重点实验室，四川成都610039）液压气动与密封/2024年第3期doi:10.3969/j.issn.1008-0813.2024.03.011摘要：为了研究水泵水轮机空化对驼峰特性的影响,采用SSTk-の端流模型和Z-wart空化模型对全流道进行了三维定常数值模拟计算，并分析了不同工况点下尾水管在驼峰区域的水力性能和内部流动状态。研究结果表明，不同工况点下，流量大小会改变尾水管区域液流的流动方向，从而产生偏心涡带使尾水管区域出现不稳定性，造成机组振动和噪声；单相计算结果比空化计算结果更早受到剪切流的影响。来流与壁面射流相互作用产生漩涡，出现回流现象。在速度梯度变化方面，空化计算结果的速度值要比单相的值高，能量损失有所增加。关键词：水泵水轮机；驼峰特性；空化；偏心涡带；数值计算中图分类号：TH137;TK734EffectofCavitationontheHumpCharacteristicsoftheTailpipeRegionLIQi-fei'-2,XIEGeng-d',LIZhan-yong",HANTian-ding",LIUSi-qi?(1.SchoolofEnergyandPowerEngineering,LanzhouUniversityofTechnology,Lanzhou730050,China;2.StateKeyLaboratoryofFluidMachineryandSystems,Lanzhou730050,China;3.KeyLaboratoryofFluidandPowerMachinery,MinistryofEducation,XihuaUniversity,Abstract:Inordertostudytheeffectofpumpturbinecavitationonthehumpcharacteristics,three-dimensionalconstantnumericalsimulationsofthefullflowchannelwerecarriedoutusingSSTk-turbulencemodelandZ-wartcavitationmodel,andthehydraulicperformanceandinternalflowstateofthetailpipeinthehumpregionunderdifferentoperatingpointswereanalyzed.Theresultsshowthattheflowmagnitudechangestheflowdirectioninthetailpiperegionatdifferentoperatingpoints,thusgeneratingeccentricvortexbandsthatcauseinstabilityinthetailpiperegion,resultinginunitvibrationandnoise;thesingle-phasecalculationresultsareaffectedbytheshearflowearlierthanthecavitationcalculationresults.Theincomingflowinteractswiththewalljettoproducevorticesandbackflowphenomenon.Intermsofvelocitygradientvariation,thecavitationcalculationresultsinhighervelocityv...
