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1、华北电力大学硕士学位论文AbstractTherearemanyfactorsinfluencingthecoronacharacteristicsoftransmissionline.Amongthem,thesurfacestateoftransmissionlineisanimportantfactor.Therefore,thereareimportantguidingsignificancetotheexperimentalinvestigationonLGJ-400/50ACSRsurfaceero
2、sioncharacteristicsinwindsandenvironment.Inthispaper,usingthetypicallineon750kVTransmissionLineProject-LGJ-400/50ACSRcableastheexperimentalmaterial,usingconcentration,windspeedandotherparametersmeasuringequipment,cooperatedwithlight-sectionmicroscopeMatlabim
3、ageprocessingprograms,thisexperimentsimulatederosioneffectsofwiresurfacestateinvariousparticlesizes,windenvironmental.Beforetheexperiment,UsingFluentsoftware,theflowfieldofwindtunnelexperimentalsectionandpressurecontouraroundthecablewassimulatedinfourdiffere
4、ntangles.Theresultsshowthat:themaximμmpressurearoundthecablewasappearedinthewindwardside,themaximμmnegativepressurewasappearedintheregionwhichtheanglewerenearly45-degreefromleewardside;Intheleewardsideitwillformtwosymmetricalvortex.Then,throughthephysicalsim
5、ulationexperiment,Theresultsshowthat:undertheconditionof30°attackangle,thewiresurfaceerosionismoreserious;trendsofthesurfaceroughnesscurvearebasicallythesame.Itcanbedividedintotwostages:thefastrisingstageandstablestage.Aftererosionsurfaceroughnessaremostlyva
6、riedin6~12μm.ByusingLS-DYNAsoftware,theimpactprocessofsingleparticleoncablesurfacewassimulatedundertheconditionofdifferentanglesandparticlesize.Theresultsshowthat:maximμmimpactforceof0.25mmsandparticlesizewas0.372MPa;maximμmimpactforceof0.5mmwas0.372MPa;Surf
7、acestressunder30°attackangleissmallerbutthestresswastangentialdirection,theimpactofstressareaislargerthantheformermethod.Withthehelpofscanningelectronmicroscope,surfacemorphologyaftertheerosioncanbeobserved.Whentheattackangleis90°wiresurfaceappearsirregulare
8、rosionpit,whileinthecasesoftheotherthreeangles,surfaceappearsduneswavesalongwiththewinddirection.Also,thispapermadetheelaborationoferosionmechanismunderthefourdifferentattackangles.Analysisonsam
