不可壓縮流體邊界層條紋結構無粘穩(wěn)定性的數(shù)值研究.pdf

1、天津大學碩士學位論文不可壓縮流體邊界層條紋結構無粘穩(wěn)定性的數(shù)值研究姓名：劉建新申請學位級別：碩士專業(yè)：流體力學指導教師：羅紀生20070601ABSTRACTIntheengineeringdesigning，consistingofthedesignoftheaircraftsandtheengines，thetransitionlocationofthefluidisanecessarycriticaldesignparameter

2、especiallyonallairplanewingoraturbinebladeItneedhaveagoodanalyseandgoodknowledgetothecharacterofthetransitionandthestabilityoftheflowForhi曲levelsoffreestreamturbulence，streakystructuresinboundarylayerwiththespanwisevaria

3、tionsalternatingwillbegeneratedAsestimatingthetransitionlocation，traditionalmethodisuselessTherefore，itneedhavingadescriptiontothestabilityofthestreakystructuresinboundarylayerAnumericalinvestigationismadefortheeffectofs

4、treakystructuresintransitionbyinviscidlineardisturbanceequationwithtemporalmodeconsistingofFourierexpansionsinhorizontaldiscretization，Cheby7shevcollocationpointinnormaldiscretizationandthird—orderdifferenceschemesintemp

5、oraldiscretizationAsinitializingthedisturbancewithTSwave，theinstablewaveitsgrowthrate，distribution，andthevariationwiththestreamwisewavenumberscanbereceivedforalongenoughtimeThefollowingconclusionsarefound：(1)Chebyshevcol

6、locationpointinnormaldiscretizationforboundarylayerisvalid(2)thewavesexponentialgrowingandperiodicalternatingareinexistenceinstreakystructuresinboundarylayer(3)fordifferentstreamwisewavenumbers，eigenvaluesareincrementala

7、tfirstanddecrementallaterwiththestreamwisewavenumberincreasingandthemaximumrateofgrowthisinexistenceatnearalpha=04；itsfrequency∞is(O21860001457i)(4)thedistributionsofeigenfunctionwithdifferentstreamwisewavenumbersarerece