转向架对高速列车气动特性影响研究

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1、西南交通大学硕士学位论文转向架对高速列车气动特性影响研究姓名：黄学辉申请学位级别：硕士专业：车辆工程指导教师：米彩盈20081201西南交通大学硕士研究生学位论文第1I页AbstractWiththeincreaseoftrainspeed，aerodynamicforceshavegreateffectsonthesafeopermionofhigh—speedtrainandtrainslipstreameffectsmaycausecriticalinfluenceonthesurroundings．Atthesametime，theforceofw

2、heel／railbecomesenhancedandtheenergyconsumptionofhighspeedtrainincreasestoo．Asaresult，ahigherdemandisputforwardforvehicledesignandoperationcontr01．Duetothecomplicationofbogiemodelingandthehugeamountofelements，theeffortofbogieonaerodynamicswasignoredinthepast．Infact，thepresenceofbo

3、gienotonlyimpactsthetrain’Saerodynamiccharacteristics，butalsohasagreateffectoncross—ventilation．Correspondingly,thewheel／railinteractionandthetemperatureofwheelareinfluenced．Sothereisanintricategroundeffectsbetweenthetrainbottomandgroundwhichisdistinguishedfromplaneaerodynamics．As

4、aresult，theresultsofthesimplifiedmodelCannotmeetthedemandofmodemhigh—speedtraindevelopment．Inthispaper,basedonthepreviousresearch，amoredetailedmodelisestablishedtoanalyzetheflowfieldandtheinfluenceofbogieonthetrainaerodynamiccharacteristicsbynumericalmethod．Ontheonehand，moreaccura

5、tedataisprovidedforthetraindesignandoperationcontrol，ontheotherhand，afoundationissetupforthefurtherresearchedonthethermalstressbetweenwheelandrailandtheinfluenceofgroundeffect．Accordingtotheflowcharacteristicsintheopeningcircumstance，onthebasisofNavier-Stokesequationandk一占two—equa

6、tionturbulencemodel．thenumericalmodelofthree-dimensionalturbulentflowfieldisestablished．TheaerodynamiccharacteristicsandextemalflowfieldcharacteristicsofthetrailwithandwithoutbogiesunderdifferentcrosswindandtrainvelocitiesaremainlystudiedbythecommercialCFDsoftwareSTAR—CD．Thevisual

7、graphresultsareobtained．Theflowvelocityandpressuredistributionaroundtrainandthecharacteristicsoftrailwakeunderdifferentoperatingconditionsaregiven．Takingthewindshieldintoconsideration{thepressuredistributiononthewindshieldgroovedepartmentisachieved．Thedragforceofthemodelwithwindsh

8、ielddecreases3．4％comparedwiththem