Page 82 - 2023年第54卷第3期
P. 82
34(10):138 - 144.
[13] 徐连琛,彭源杰,唐雯,等.水泵水轮机在 S特性区的流态及压力脉动研究[J].水动力学研究与进展(A
辑),2022,37(2):213 - 225.
[14] KOCKF,HERWIGH.Localentropyproductioninturbulentshearflows:ahigh - Reynoldsnumbermodelwith
wallfunctions [J].InternationalJournalofHeatandMassTransfer,2004,47(10?11):2205 - 2215.
[15] LID,GONGR,WANGH,etal.Entropyproductionanalysisforhumpcharacteristicsofapumpturbinemodel
[J].ChineseJournalofMechanicalEngineering,2016,29(4):803 - 812.
[16] 卢金玲,王李 科,廖 伟 丽,等.基 于 熵 产 理 论 的 水 轮 机 尾 水 管 涡 带 研 究 [J].水 利 学 报,2019,50(2):
233 - 241.
[17] 钱忠东,陆杰,郭志伟,等.水泵水轮机在水轮机工况下压力脉动特性 [J].排灌 机 械 工 程 学 报,2016,
34(8):672 - 678.
[18] 郭俊勋,周大庆,陈会向,等.导叶波动对抽蓄 机 组 低 水 头 空 载 稳 定 影 响 分 析 [J].中 国 电 机 工 程 学 报,
2022,42(15):5587 - 5595.
[19] 许哲,郑源,阚阚,等.基 于 熵 产 理 论 的 超 低 扬 程 双 向 卧 式 轴 流 泵 装 置 飞 逸 特 性 [J].农 业 工 程 学 报,
2021,37(17):49 - 57.
[20] 张翔,王洋,徐小敏,等.低比转数离心泵叶轮内能量转换特性[J].农业机械学报,2011,42(7):75 - 81.
[21] CELIKIB,GHIAU,ROACHEPJ,etal.Procedureforestimationandreportingofuncertaintyduetodiscreti
zationinCFDapplications [J].JournaloffluidsEngineering - TransactionsoftheASME,2008,130(7):1 - 4.
Analysisofhydrauliclossmechanism ininverseS - shapedregionof
pump - turbinebasedonentropygenerationtheory
1,2
1
2,3
1,2
1
KANKan ,YANGHaocheng,ZHENGYuan ,DUANHuiling,CHENHuixiang
(1.CollegeofEnergyandElectricalEngineering,HohaiUniversity,Nanjing 211100,China;
2.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing 210024,China;
3.CollegeofAgriculturalScienceandEngineering,HohaiUniversity,Nanjing 211100,China)
Abstract:Whenthepumpturbineisoperatingintheturbinecondition,itiseasytoentertheunstableinverseS -
shapedregion,whichaffectsthesafeandstableoperationoftheunit.Thetraditionaldifferentialpressuremethod
cannotobtainthespecificdistributionanddetailedsourceofthehydrauliclosswhencalculatingthehydraulicloss,
sothehydrauliclossmechanismofpumpturbineininverseS - shapedregionstillneedstobefurtherstudied.Inthis
paper,theReynoldstime - averagingmethodisusedtosimulatetheoperatingconditionsintheinverseS - shaped
regionofaprototypepumpturbinewiththemovableguidevaneopeningof12°and35°respectively.Basedonthe
entropygenerationtheory,thehydrauliclossesofeachflowcomponentsanddifferenttypesarequantitativelyana
lyzed.Combinedwiththedistributionofflowfield ,thedistributioncharacteristicsandcausesofhydrauliclossare
furtheranalyzed.TheresultsshowthatwhenthepumpturbineenterstheinverseS - shapedregion ,theproportion
ofthehydrauliclossintheguidevanesectiontothetotalhydrauliclossincreasesgradually ,whilethehydraulic
lossintherunnersectiondecreasesgradually.Amongdifferenttypesofenergyloss ,turbulententropygenerationis
dominant ,followedbywallentropygeneration,anddirectentropygenerationistheleast.Asthepumpturbineen
tersthedeepinverseS - shapedregion ,theareawithlargeindirectentropyproductionlossintherunnerzoneshifts
fromthebladepressuresurfaceattherunnerinlettothesuctionsurfaceattherunneroutlet.Whenthepumptur
bineislocatedintheinverseS - shapedregion ,therunnerdoesworkonthewaterflowandinputsenergyandprop
agatesupstream ,makingthetotalpressureinthebladelesszonerisesignificantly,andtheincreaseoftheopening
oftheactiveguidevanewillsignificantlyincreasetheamplitudeoftheflowenergyinthebladelesszone.
Keywords:pump - turbine;numericalsimulation;entropygenerationtheory;inverseS - shapedregion;hydraulic
loss
(责任编辑:王 婧)
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