微型厢式汽车后扰流板对气动特性影响的数值模拟研究-车辆工程专业论文.docx

英文摘要A B STR A C TA long w ith develoPm entofour country econom y，m inibus ofthe dom esticallyProdu cedobtainsm ore and m ore the w idesPread u sed，50 the safety Perfo rm an ee ofm inibus15m oreandm oretakenbythePeoPle.Using themethod ofeomPutation h川romeeh耐esand FLUENT oflarge一sealeeornpnercialCFDsoftw are ea币eson nupneriealsim ulation on m inibus，externalflowfield.F irstly，the eomLmon two equations turbulence m odeling including standard k一em o d el，RN Gk一em o del，SST k一①m o d elarein trodueed and eo m Pared.Then using thesethree kinds ofturbulence m odeling earryon num ericalsim ulation on obtuse A hm ed，externalflow field.Theresult15eom Pared w iththeresultofw ind tunnelexPerim ent，50them ostsuPerioreom Putationm odel15selected.This叭icleselectstheSST tuthuleneem odelingtotakenum eriealsim ulation onm inibus’extem alflow field.Thequalityofgridalso15greatlyaffectsthecalculationPrecision，theeonfignrablegrid，thenon一confignrableghd andthemix幼dhasresPeetivegoodandbadPoints，thereforeaccording to objectiveParameteroftheminibus，flow field design severalkindsPlan ofeom Partmentalizing grid ，and discusstheirgood and bad Points.ThesuPeriorPlanofeom Partm entalizinggrid15selected.Theminibushasinstalledrear sPoilerwiththedi月七rent shaPe，thedl到飞rent angle，the difl七rentPosition and the difl七rentm ethod .The aerod邓am ic ProP erties thesem odelsare analyZed，through theirresultofnurnericalsimu lation analysisand theeontrast，w e elearly understand thatthe unique function wh ich the aerod户am ieProPertiesofm inibusdisPlayed.ThI0ugh theeom Putation analysis，werealizetheairflow m echanism around the m inibusand analyZed the Production PrineiPle ofm inusriseforcearoundrearsPoilerandcaudaeddyhow toaffeetresistance.A ftereom Putation sim ulation installm entextem alflow field ofthe m in ibusw ithrearsPoiler，ProPosed reasonablein stallm entofthe sh ape，the Position and the angle.R earsPoilernotoulym akestheautom obilethe