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《轉(zhuǎn)向架對高速列車氣動特性影響研究》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、西南交通大學(xué)碩士學(xué)位論文轉(zhuǎn)向架對高速列車氣動特性影響研究姓名：黃學(xué)輝申請學(xué)位級別：碩士專業(yè)：車輛工程指導(dǎo)教師：米彩盈20081201西南交通大學(xué)碩士研究生學(xué)位論文第1I頁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
