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时间:2019-10-18
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1、NATIONALAERONAUTICSANDSPACEADMINISTRATION+TextOnlySite+Non・FlashVersion+ContactGlennFINDIT@NASA:+G0+WORKFOR+MISSION+MYNASlngBn@Vocabulary+ABOUTNA+NEWS&EVE!+MULTIMECWhatisAeronautics?
2、DynamicsofFlight
3、Airplanes
4、Engines
5、HistoryofFliqhtIWhatisUEET?Vocabularv
6、
7、FunandGames
8、EducationalLinks
9、LessonPlans
10、SiteIndex
11、HomeVocabularyAviationAeronauticsisthestudyofthescieneeofflight.AerodynamicsThestudyofhowairflowsaroundtheairplane.AirAirisaphysicalsubstaneewhichhasweightandismadeupofmoleculeswhichareconstantlymoving.M
12、ovingairhasaforcethatwillliftkitesandballoonsupanddown.Airisamixtureofdifferentgases;oxygen,carbondioxideandnitrogen.AirfoilsThewingsofaplane・AileronsTheyarehingedonthewingsandmovedownwardtopushtheairdownandmakethewingtiltup.CombustorInthecombustortheairi
13、smixedwithfuelandthenignited・Thisprocessresultsinhightemperature,high-energyairflow・Thefuelburnswiththeoxygeninthecompressedair,producinghotexpandinggases.CompressorThecompressoristhefirstcomponentintheenginecore・Itismadeupoffanswithmanybladesanditisattac
14、hedtotheshaft.Thecompressorsqueezestheairandcreatesanincreaseintheairpressure・Thesquashedairisforcedintothecombustionchamber.DragResistaneethatslowsanobjectdownintheair.Itemsthatarestreamlinedhavelessdraginair.Elevatorsarefoundattherearoftheplane.Theycanb
15、eraisedorloweredtochangethedirectionoftheplanersnose.Theplanewillgoupordowndependingonthedirectionofthattheelevatorsaremoved・FanThefanisthefirstcomponentoftheturbofanengine.Thelargespinningfansucksinlargequantitiesofair.Thebladesofthefanpulltheairintothee
16、ngine.FinistheverticalpartofthetailFlapsTheflapsslidebackanddowntoincreasethesurfaceofthewingarea・FuselageThebodyoftheplaneGasTurbineAnothertermforengine・Gravityaforcethatpushesobjectscomedowntotheearth・HypersonicThisisthespeedofflightthatisusedbyrocketsi
17、nouterspace・Rocketscantravel5to10timesfasterthanthespeedofsound.Thatmeansthespeedis3500-7500MPH.AnexampleofthisspeedistheSpaceShuttle.LandingGearThewheelsofaplane.LawsofMotion-SirIsaacNewtonproposedthreelawsofmotion
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