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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
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