美国NTF风洞简介

NationalAeronauticsandSpaceAdministrationNationalTransonicFacilityNASA’sAeronauticsTestProgramdevelopment.TheNationalTransonicFacility,orNTF,istheworld’slargestpressurizedcryogenicwindtunnel.ItsuniquecapabilitiesenabletestingofscaledmodelsatflightReynoldsnumbersinsupportofadvancedaerodynamicconceptdevelopmentandassessment,advancedcomputationalfluiddynamicstoolvalidation,andriskreductionforvehicleTheNTFprovidesthelargestrangeofReynoldsnumbertestingintheworld.Itcanuseeitherairornitrogengasatambienttemperaturesmatchingconditionsofconventionalwindtunnels.Atcryogenictemperatures,nitrogengasisusedtoachievethehighestReynoldsnumbertestingintheworld.Supportisprovidedforbothfull-spanandsemispantestingwithawiderangeofinstrumentationandmeasurementtechniques.• ProvidesthehighestReynoldsnumbertestingcapabilityintheworld• MatchesandselectivelyisolatesMachnumber,Reynoldsnumber,andaeroelasticeffectstoaccuratelydetermineandunderstandvehicleperformancewhileinthecryogenicmode• Providestestingandconfigurationaerodynamicsvalidationforbothfull-andhalf-spanmodelsforexistingandnewvehicleconcepts• Adjustableairflowtomatchmodelsize• Designtoolverificationatflightconditions• PreflightriskreductionatflightconditionsCharacteristicsTestsectiondimensions8.2fthighby8.2ftwideby25ftlongArea66.8ft2SpeedMach0.1to1.2Reynoldsnumber4to145×106perftTemperature–250to150°FPressure15to130psiTestgasNitrogenandambientatmosphereCircuitlength497ftDrivepower135000hpContractionarearatio14.95:1InputsAnalog,digital,andfrequencyandpulsetrainControllerUNIXCapacity/channelsAnalog/256,Digital/32,Frequency/1Dynamicdataacquisition64channelsCustomercomputersYesClassifiedcapabilityYesInstrumentationFacilityApplications• VehicletestingsuchastheBoeing777and787,thespaceshuttleandbooster,aswellastransport,fighter,andbusinessjets• Blended-wing-bodydesigntestingsuchastheB–2bomber• LaunchvehicletestingsuchastheDeltaIIDataAcquisitionandProcessingContactInformationStraingaugebalancesSix-componentinternalAvailablecorrectionsInteractions,temperatureeffects,attitudetares,axesorientation,pressuretares,andmomentum(flow)taresAngle-of-attack(AOA)accelerometersThermalconditioningsystemsavailableandaccelerometersforcryogenicoperationElectronicallyscannedpressure(ESP)systemRatesupto500samplespersecondModulesareavailableindifferentialpressuresof2.5,5,15,30,and45psi.(Bill)Bissett,Jr.NASALangleyResearchCenterPhone:757–864–5111E-mail:[e-mail]’sAeronauticsTestProgram–1870–7Nov07