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时间:2019-05-19
《水泵水轮机增负荷过程尾水管内流场分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2015年1月第33卷第1期Jan.2015Vol.33No.1doi:10.3969/j.issn.1674-8530.14.0131水泵水轮机增负荷过程尾水管内流场分析11112李仁年,蒋雷,李琪飞,韩伟,刘保福(1.兰州理工大学能源与动力工程学院,甘肃兰州730050;2.青海黄河上游水电开发有限责任公司工程建设分公司,青海西宁810008)李仁年摘要:为了研究水泵水轮机增负荷过程中尾水管内的瞬态流动特性,基于Fluent动网格模型对模型水泵水轮机增负荷过程进行了全流道数值模拟.根据模拟结果,重点分析了尾水管内流场结构的演变过程.结果表明:负荷增加过程中,尾水管内锥管段至肘管段末端的压力
2、变化规律基本相似.静压值的突增和剧烈波动过程仅发生在开度变化的初始阶段(0~0.9s).当0.9s以后,波动平均值不超过9.76kPa,静压基本保持稳定;此外,发现开度较小时尾水管内存在明显的涡带和回流涡结构,容易导致机组运行的不稳定;随着开度的增大,尾水管内流态逐渐平稳,说明流量的增大会使得尾水管内流动更加流畅.关键词:水泵水轮机;尾水管;瞬态流动;增负荷;动网格;数值模拟中图分类号:S277.9;TK734文献标志码:A文章编号:1674-8530(2015)01-0049-06李仁年,蒋雷,李琪飞,等.水泵水轮机增负荷过程尾水管内流场分析[J].排灌机械工程学报,2015,33(1):4
3、9-54.LiRennian,JiangLei,LiQifei,etal.Analysisofflowfieldindrafttubeofpump-turbineduringloadincreasingperiod[J].Jour-nalofDrainageandIrrigationMachineryEngineering(JDIME),2015,33(1):49-54.(inChinese)Analysisofflowfieldindrafttubeofpump-turbineduringloadincreasingperiod11112LiRennian,JiangLei,LiQifei,
4、HanWei,LiuBaofu(1.SchoolofEnergyandPowerEngineering,LanzhouUniversityofTechnology,Lanzhou,Gansu730050,China;2.QinghaiEnginee-ringConstructionBranchOffice,YellowRiverUpstreamHydropowerDevelopmentCo.Ltd.,Xining,Qinghai810008,China)Abstract:Tostudytheinternaltransientflowcharacteristicsofthedrafttubein
5、apump-turbinedu-ringitsloadincreasingperiod,theunsteadyfluidflowinthepump-turbineissimulatedbasedonthedynamicmeshmethodinFluent.Accordingtothesimulatedresults,thetransientevolutionofflowstructureinthedrafttubeisanalyzedextensively.Theresultsshowthattherelationshipsofpressurewithtimearebasicallysimil
6、arintheconeandelbowduringtheperiod.Asuddenincreaseandre-markedfluctuationinstaticpressurejustoccursatthefirstperiodoftime(0-0.9s)duringthewi-cketgateopeningstartingtochange.After0.9s,theaveragedfluctuationinthestaticpressureisnotbeyond9.76kPa,showingthestaticpressureremainsconstantroughly.Besides,an
7、otablevortexropeandareverseflowstructureexistinthedrafttubeinsmallerwicketgateopenings,whichcaneasilyleadtotheinstabilityinoperationofthepump-turbine.Withtheincreasingwicketgateopening,theflowinthedra
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