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时间:2020-06-03
《基于CFD的液力透平结构优化.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第4O卷第2期兰州理工大学学报Vo1.40No.22014年4月JournalofLanzhouUniversityofTechnologyApr.2014文章编号:1673—5196(2014)02-0060-05基于CFD的液力透平结构优化杨军虎,龚朝晖,夏书强,罗凯凯,李海龙(兰州理工大学能源与动力工程学院,甘肃兰州730050)摘要:为优化液力透平结构,研究导叶对液力透平运行性能的影响,以比转速分别为41.0、55.7、84.5的离心泵为对象,运用叶片式水力机械工作原理,设计出3种比转速泵各自的导叶.基于N-S方程和标准湍流模型,采用贴体坐标系、非结构化四面体网格和S
2、IMPLE算法,应用CFD软件对3种比转速离心泵设计添加导叶反转作透平在不同流量工况下进行数值计算,得到透平运行的外特性曲线并分析内部流动规律.结果表明:对于低比转速离心泵反转作液力透平,添加导叶可以有效提升透平的效率,增加最高效率点时的流量,降低液力透平的压头.内流场分析表明,添加导叶后叶轮流道内的速度分布得到明显改善,其内部区域的漩涡数量减少、漩涡尺寸明显变小;压力分布均匀对称.说明透平添加导叶改善了叶轮的内部流动,提高了液力透平的运行稳定性.关键词:导叶;液力透平;数值模拟;流场分析中图分类号:TH311文献标识码:AStructureoptimizationofhyd
3、raulicturbinebasedonCFDYANGJun-hu,G0NGZhao-hui,XIAShu—qiang,LUOKai—kai,LIHai—long(CollegeofEnergyandPowerEngineering,LanzhouUniv.ofTecK,Lanzhou730050,China)Abstract:Inordertooptimizethestructureofthehydraulicturbineandstudytheeffectofguidevaneontheperformanceofacentrifugalpumpashydraulictur
4、bine,threepumpswithspecificspeedN。一41.0,55.7,and84.5wereselectedandtheguidevaneofthethreepumpswasdesignedbyusingtheworkingprincipleofthevanehydraulicmachinery.CFDsoftwarewasadoptedtosimulatetheflowfieldofthethreepumpsworkingasturbinewithoppositelyturnedvanesfordifferentflowconditions.Thenum
5、ericalsimu—lationwasbasedonN-Sequations,standardk-eturbulentmode,SIMPLECalgorithm,body-fittedcoordi—natesystem,andun-structuredtetrahedralmeshes.Theexternalcharacteristiccurvesoftheturbinewereobtainedandtheinternalflowoftheturbinewasanalyzed.TheresultsindicatedthatfortheIOWspecific-speedpum
6、pworkingasturbine,theaddedguidevanecouldimprovetheefficiencyeffectively,increasetheflowatthebestefficiencypointandreducetheheadoftheturbine.Theinternalflowanalysisindicatedthatwithaddedguidevane,thevelocitydistributionintheimpellerpassagewasimprovedremarkably,thenumberofthevortexintheimpell
7、erpassagewasreduced,thesizeofthevortexwassignificantlyde—creased,andthepressureintheimpellerpassagesdistributedsymmetrically,showingthattheturbinewithaddedguidevanescouldmaketheinternalflowintheimpellerpassageandtheoperationstabilityofthehydraulicturbine
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