特高压新月形覆冰导线气动力特性的数值模拟分析

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1、西南科技大学硕士研究生学位论文第III页AbstractIn2009,China'sfirstUHVpowertransmissionproject1000KVJindongnan-Nanyang-JingmenUHVACtestdemonstrationprojectputintocommercialoperationofficially,itindicatesthatChina’sUHVpowertransmissionhasenteredaneweraoflongdistance、largecapacityandlowloss

2、.TheUHVpowertransmissionlinesdistributedinawiderangeareasofchina,theareasshowdifferentclimateandgeography,thelineswillicebecauseoftheactionofnaturewindunderthespecialclimateconditions,finallytheshapeoftransmissionwirewaschangedintonon-circularcrosssection,whichiseasyto

3、causethelowfrequency、largeamplitudewavesandcausesseriousdamageandirreparableeconomiclossestotransmissiontowerandotherimportantstructures.Inordertosolvethisproblem,twokindsofsinglewireandUHVbundledconductorswerestudiedbasedonthecombinedmethodofwindtunneltestandnumerical

4、analysisinthispaper,themainworkisasfollows:First,thepaperestablishedicedtransmissionwiremodelmodelledontherealityoficedtransmissionwirebasedonthewindtunneltestaccordingtofluidmechanicscomputingsoftwareFLUENTandthemodelusestwo-dimensionalmodelconsideringthefrequentengin

5、eeringstatusandtheparticularityoficedtransmissionwire.Second,thepapercalculatedthethreecomponentcoefficientsoftwokindsofsinglewire.andanalyzedthediameteroftransmissionwirewhichinfluencedonthethreecomponentcoefficientsoficedtransmissionwire.Finally,thepaperanalyzedtheat

6、tackangleareaoftwokindsofsingleconductorgallopbasedonthedenHartoggallopingmechanismandNigelgallopingmechanism.Theresultsshowthatthedragcoefficientcurveandliftcoefficientcurveexistslargedifferencebetweentinewireandthickwire,butthetorquecoefficientcurvehaslittledifferenc

7、e.Theeasygallopingregionoftherealthinicedtransmissionwireandthickwiremodelisinα=170°~180°.AccordingtotheNigelcriterion,theeasygallopingregionoftherealthinicedtransmissionwireandthickwiremodelisinα=10°~50°andα=150°~170°.Comparedwithrealthinicedtransmissionwire,therealth

8、ickicedtransmissionwirehasalargeraerodynamicnegativedampingzoneandnegativepeak.西南科技大学硕士研究生学位论文第IV页Accordingtotheexper