運(yùn)動(dòng)激波作用下氣體界面的變形與發(fā)展研究.pdf

1、中國(guó)科學(xué)技術(shù)大學(xué)碩士學(xué)位論文運(yùn)動(dòng)激波作用下氣體界面的變形與發(fā)展研究姓名：黃甲申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：流體力學(xué)指導(dǎo)教師：羅喜勝尹協(xié)振20090601摘要AbstractFlowswithdensi鑼inhomogeneitiesacceleratcdbyh譫hene唱ysourcesareattnlctingincrcased他searcha仕entionbecauseofpossibleapplicationt0inertialconf

2、inementfusion，andaStrophysicaIsupemovaremnantinteractionsThese叩∞如刪謝加加聊9艫即∞姍／zD榔arerelatcdt0Richtmye卜MeshkoVinS詛biI時(shí)(I洲I)enVironmentsBecauSeofitsimportanceinnationalsecurity，researcheshavebeencarriedoutinChinaforrecentyea

3、rSHowever，moStoftheworkinthisfieldwaLsn啪ericalsimulation111isstudypr0VidesadetailstudyofmedeveJ叩mentofthisinstabi“tyinagaseousinterfacebyexperimentsandnumericalsimulationTheeVolutionofasphericalgas—gasinterfaceimpactcdby

4、aplanarshockwaveisstudiedinashocktubeAso印filmisusedtocreatethegasgasinterf；aJcebyseparatingtheHe／SF6／Ar，Airbubble行omtheworkgasarTheinterfaceinstabili夠isVisuaIizedbymeansofshado、Vgr印horshIierenThedevelopmentoftheinter角cei

5、nstabi“砂canbefound舶maseriesofpicturesThenumericalmethodsolVesthet、ⅣodimensionalaXsymmetricEulerequationinanadaptiveunstllJcturedmeshForHe／Airinte以ce，theheIiumbubblestanStodeformfromspheretoellipsoidwhentheplanarshockinte

6、ractSwithitThenthesurroundingairbeginstoentertotheheliumbubbleandf0徹stheSpikeandmushr00mstructures，and6nallyaturbulentmixingstageisreachedItisfoundnumericallythatthegenerationanddis仃ibutionofvorticityduringtheinteraction

7、plays鋤importantroleforthedefomation粕ddeveIopmentoftheinterfaceForSF6／_Airc嬲e，theinte娟∞eeVolutioniscompletelydifferentbecauseofthedi脯rentjumpins陽(yáng)婦ofsoundThereflectedshock舫ntcun，esduringthepropagationinthebubble，andfinally

8、focusesintoahighpressure，highdensi哆zone，whicheventuallycreatesajetNumericaIresultSalsoshowthegreatincreaseofmeshocksn℃n舒hThercf0佗，thepressuredisturbanceisthemainmechanismintheearIystageoftheeVolutionAstimeprocceds，theinf

9、luenceoftheVonexbecomesimportantanddominates矗nallyItisalsofoundthatthenumericalpredictionwillgreatlydeViatcfromtheexperimentalmeaSurementifthenumericalmethodignorestherealviscousef野：ctTheairbubbledoesearlystageoftheimpac