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【英文标准名称】:StandardTestMethodforMeasuringHeatTransferRateUsingaThin-SkinCalorimeter
【原文标准名称】:用薄皮热量计测量传热速率的标准试验方法
【标准号】:ASTME459-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E21.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:叠层板材;纤维;航天技术;热量计;热传递;规范(验收);材料;测量;航空航天运输
【英文主题词】:calorimeter;convective;heatflux;heattransferdistribution;heattransferrate;radiative;thin-skin
【摘要】:Thistestmethodmaybeusedtomeasuretheheattransferratetoametallicorcoatedmetallicsurfaceforavarietyofapplications,including:3.1.1Measurementsofaerodynamicheatingwhenthecalorimeterisplacedintoaflowenvironment,suchasawindtunneloranarcjet;thecalorimeterscanbedesignedtohavethesamesizeandshapeastheactualtestspecimenstominimizeheattransfercorrections;3.1.2Heattransfermeasurementsinfiresandfiresafetytesting;3.1.3Laserpowerandlaserabsorptionmeasurements;aswellas,3.1.4X-rayandparticlebeam(electronsorions)dosimetrymeasurements.Thethin-skincalorimeterisoneofmanyconceptsusedtomeasureheattransferrates.Itmaybeusedtomeasureconvective,radiative,orcombinationsofconvectiveandradiative(usuallycalledmixedortotal)heattransferrates.However,whenthecalorimeterisusedtomeasureradiativeormixedheattransferrates,theabsorptivityandreflectivityofthesurfaceshouldbemeasuredovertheexpectedradiationwavelengthregionofthesource.In4.6and4.7,itisdemonstratedthatlateralheatconductioneffectsonalocalmeasurementcanbeminimizedbyusingacalorimetermaterialwithalowthermalconductivity.Alternatively,adistributionoftheheattransferratemaybeobtainedbyplacinganumberofthermocouplesalongthebacksurfaceofthecalorimeter.Inhightemperatureorhighheattransferrateapplications,theprincipaldrawbacktotheuseofthin-skincalorimetersistheshortexposuretimenecessarytoensuresurvivalofthecalorimetersuchthatrepeatmeasurementscanbemadewiththesamesensor.Whenoperationtoburnoutisnecessarytoobtainthedesiredheatfluxmeasurements,thin-skincalorimetersareoftenagoodchoicebecausetheyarerelativelyinexpensivetofabricate.FIG.1TypicalThin-SkinCalorimeterforHeatTransferMeasurement1.1Thistestmethodcoversthedesignanduseofathinmetalliccalorimeterformeasuringheattransferrate(alsocalledheatflux).Thermocouplesareattachedtotheunexposedsurfaceofthecalorimeter.Aone-dimensionalheatflowanalysisisusedforcalculatingtheheattransferratefromthetemperaturemeasurements.Applicationsincludeaerodynamicheating,laserandradiationpowermeasurements,andfiresafetytesting.1.2Advantages1.2.1SimplicityofConstructionThecalorimetermaybeconstructedfromanumberofmaterials.Thesizeandshapecanoftenbemadetomatchtheactualapplication.Thermocouplesmaybeattachedtothemetalbyspot,electronbeam,orlaserwelding.1.2.2Heattransferratedistributionsmaybeobtainedifmetalswithlowthermalconductivity,suchassomestainlesssteels,areused.1.2.3Thecalorimeterscanbefabricatedwithsmoothsurfaces,withoutinsulatorsorplugsandtheattendanttemperaturediscontinuities,toprovidemorerealisticflowconditionsforaerodynamicheatingmeasurements.1.2.4Thecalorimetersdescribedinthistestmethodarerelativelyinexpensive.Ifnecessary,theymaybeoperatedtoburn-outtoobtainheattransferinformation.1.3Limitations1.3.1Athigherheatfluxlevels,shorttesttimesarenecessarytoensurecalorimetersurvival.1.3.2Forapplicationsinwindtunnelsorarc-jetfacilities,thecalorimetermustbeoperatedatpressuresandtemperaturessuchthatthethin-skindoesnotdistortunderpressureloads.Distortionofthesurfacewillintroducemeasurementerrors.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5......
【中国标准分类号】:A42
【国际标准分类号】:17_200_10
【页数】:7P.;A4
【正文语种】: