高空高超音速平板邊界層擾動(dòng)演化的數(shù)值研究.pdf

1、天津大學(xué)碩士學(xué)位論文高空高超音速平板邊界層擾動(dòng)演化的數(shù)值研究姓名：楊永祥申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：流體力學(xué)指導(dǎo)教師：曹偉20070601ABSTRACTVelocityandtemperaturediscontinuityonwallsurfaceoccurewhensustainedhypersonicflightsflyathighaltitudewhereairisrarefied，itisverydifferentfromsupe

2、rsonicflightsHowtheeffectoflowdensityOilflowcharacteristicanddragisanimportantissueworthstudyInthispaperNavierStokesequationsandslipboundaryconditionsareusedtostudytheevolutionof2Ddisturbanceinahypersonicfateplateboundar

3、ylayerwiththeoncomingflowofMachnumber8Thefrictioncoefficientandheattransferonsurfaceoffiatplatealealsostudiedtocompare晰ththoseofnonslipboundaryconditions111econclusionsare：1耽eeffectofnonlinercan’tbeignoredwhentheamplitud

4、eof“rswavereachto0007in21)hypersonicflatplateboundarylayerItcanbeseenbythechangeofinstabilityregionandthefluctuationofupperbranchofneutralcurveGrowthrateofperturbationbecomepositiveandnegativealternativelywhengothroughth

5、ebranchandtheamphtudegrowthCUlWefluctuatesButthesameresulthash’toccurwhenstudyevolutionofdisturbanceatlowaltitude、)l，ithMach=8andhi曲altitude、)l，i也Maeh=452Thefrictioncoefficientandheattransferbecomesmalleralongthestreamwi

6、seAstemperatureofthewalldecreases，frictioncoefficientdiminisheswhereasheattransferincreases3Inthe2DwedgeflowAstheangleofthewedgeincrease，thevalueofKnbecomeslarger4Comparedwiththeresult、jl，i也nonslipboundaryconditions，thef