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                             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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