the full flowpath analysis of a hypersonic vehicle

《the full flowpath analysis of a hypersonic vehicle》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、TheFullFlowpathAnalysisofaHypersonicVehicleAvailableonlineatwww.sciencedirect.(tom‰棼蹲ScienceDirectChineseJournalofAeronautics20(2007)385—393ChineseJournaIofAeronautics;;;;;;;;;;=;;;;;;;;;;;;;;;;www.elsevier.com/locate/~aTheFullFlowpathAnalysisofaHypersonicVehicl

2、eSunShu,ZhangHongying,ChengKeming,WuYizhaoCollegeofAerospaceEngineering,NanjingUniversityofAeronauticsandAstronautics,Nanjing21001~ChinaReceived9November2006;accepted31August2007AbstractAnumericalstudyhasbeencarriedouttoinvestigatethefullflowpathandaerodynamicch

3、aracteristicsofahypersonicvehicleata7.0fleestreamMachnumber.Resultsindicatethattheinletstartedandunstartedoperationshaveremarkableeffectsontheflowpat—ternofthefullflowpath.Whentheinletoperatesinastartedmode,thetransversepressuregradientgeneratedbytheforebodyalte

4、rstheaircapturedcharacteristicsandtheenteringflowqualityoftheinlet.Furthermore,theexpansionprocessofthenozzlejetflowisobvi—ouslyaffectedbytheexternalflowfieldaroundtheaflerbodywiththecrosssectionshapetransitingfromanearrectangleattheexitofthenozzletoaneartriangl

5、eatthetailofthevehicle.Whentheinletoperatesinanunstartedmode,theaerodynamicinstabilitycanbeobservedinthefullflowpathofthevehicle.Duetotheoscillationoftheexternalcompressedshockwaveandnozzlejetflow,theaerodynamiccharacteristicsofthevehiclevaryperiodicallywiththel

6、ift—dragratiochangingfromO.25to2.09.Finally,bycomparingtotheexperimenmldata,thereliabilityoftheCFDisverified.Keywords."hypersonicvehicle;fullflowpath;inletstart;inletunstart;unsteady;lift—dragratio1IntroductionTheinsufficientnetthrustobtainedbyhyper—sonicvehicle

7、sposesaformidablechallengetothedesignofvariousaerodynamiccomponentsinthepropulsionsystemandtheairframe.Onepromisingtechnologythatiscapableofmeetingthechallengeistheairframe/propulsionintegration.Sincethe1960s,alotofresearchstudieshavebeendedicatedtotheintegratio

8、nofthepropulsionsystemwiththehypersonicairframe,includingtheintegrationoftheinletwiththeforebody,theintegrationofthenozzlewiththeaflerbody,theoptimizationofthefullflo