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                    Modelsandcharacteristicsofsand - containedwaterhammerinwatertransferconduit

                                     WANGYiran,YUXiaodong,SHILin,ZHANGJian
                           (CollegeofWaterConservancyandHydropowerEngineeringHohaiUniversity,Nanjing 210098,China)


                  Abstract:Theaccuratedescriptionofwaterhammerphenomenonhasavitalimpactonthesafeandstableopera
                  tionoflong - distancewatersupplyprojects.However ,thetraditionalmathematicalmodelisnotenoughtodiscuss
                  andanalyzethemechanism andlawofsand - containedwaterhammerinpipelines.Inthispaper ,theequivalent
                  frictionofpipelineisdefinedbasedonFeiXiangjun ’sresistancemodel.ReferringtoHanWenliang’sslurrywater
                  hammerwavevelocityformula,thecharacteristicsequationofsedimentladenwaterhammerisdeduced.Thevalve
                  closingwaterhammerpressureofRPVsystemunderdifferentsedimentparticleparametersiscalculatedbymethod
                  ofcharacteristics ,whichiscomparedwiththatofcleanwater.Theresultsshowthatthecleanwaterhammertransi
                  entpressurecalculatedbynumericalsimulationisingoodagreementwiththeexperimentaldata.Theincrementof
                  sand - containedwaterhammerpressureispositivelycorrelatedwithsedimentconcentrationbuthasnothingtodo
                                                                  3
                  withparticlediameter ,andthemaximumpressureof100kg?m is77.91m,whichis7.71% higherthanthatof
                  purewatertestdata.Thepipelineroughnessconvertedfromequivalentfrictionispositivelycorrelatedwithsediment
                  concentrationandparticlediameter ,andnegativelycorrelatedwithinitialflowvelocity.Theresearchresultsprovide
                  areferenceforthesafeoperationandwaterhammerprotectionoflong - distancewatersupplyprojectsinhigh - sand
                  watersheds.
                  Keywords:watertransferconduit;heterogeneousflow;sand - containedwaterhammer;methodofcharacteristics;
                  numericalsimulation

                                                                                    (责任编辑:李福田)











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