涡轮增压器的功率测量PPT文档格式.pptx
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涡轮增压器的功率测量PPT文档格式.pptx
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ConceptsNREC,PowerMeasurement,NickBainesConceptsNREC,Powermeasuringmethods,ConceptsNREC2003,TorquemeterDynamometerTemperaturemeasurement,Torquemeter,MeasureshaftstrainusingstraingaugebridgeAutomaticconversiontotorque,ConceptsNREC2003,Thetransformersthemselvesareapairofconcentricallywoundcoilswithonecoilrotatingwithinorbesidethestationarycoil.Themagneticfluxlinesareproducedbyapplyingatimevaryingvoltagetooneofthesecoils.Ahighpermeabilitycoreisaddedtoconcentratefluxinamagneticpathandimprovecouplingbetweencoils.,Rotarytransformer,AnalternativetoslipringsMorerobustnoslidingcontactsMorepronetoEMandRFinterference,ConceptsNREC2003,Themainadvantageisthatthereisnocontactbetweentherotatingandstationaryparts,norarebearingsnecessarytosupportanon-rotatinghousingasisthecasewithstrain-gaugesystems.Themaindisadvantagesarepoorresolutionatlowspeedandthedifficultyofinitialcalibration.Overallaccuracyisgenerallyintherange15%.,Phaseshifttorquemeter,Measurephaseshaftcausedbyshaftwind-upNon-contactingResolutionisafunctionofspeed,ConceptsNREC2003,Inthislargehydraulicdynamometereachfaceoftherotorcontainssemi-ellipticalpocketsdividedfromoneanotherbyobliquevanes.Theinternalfacesofthecasingarepocketedinthesameway.Therotordischargeswaterfromitsperipheryintothespacesformedinthecasing,fromwhichitisthenreturnedintothepocketsatapointneartheshaft.Thepowerabsorptioniscontrolledbyvaryingthequantityofwaterinthepocketsbymeansofavalveatoutlet.,Hydraulicdynamometer1,ConceptsNREC2003,Hydraulicdynamometer2,ConceptsNREC2003,Hydraulicdynamometers3,ConceptsNREC2003,Hydraulicdynamometers4,ConceptsNREC2003,Anadvantageofusingoilastheabsorptionmediumisthatthesamefluidcanalsobeusedfordynamometerbearinglubrication.Thewholeassemblyfloatsintrunnionbearingssothatthetorquecanbemeasureddirectlybymeansofaloadcell.,003,Oildynamometer,ConceptsNREC2,Thedrummaterialrequiresahighmagneticpermeability,highresistivity,andhighstrengthattheworkingtemperaturetowithstandthecentrifugalstresses.Materialswiththerightelectromagneticproperties(e.g.iron)areusuallymechanicallyweak,andanoutershellofnon-magneticmaterialsuchaswoundcarbonfibremaybenecessaryforstrength.Thepowerthatcanbeabsorbedrisesasthesquareoftherotorspeed,butthelimitingfactormaybethesetbythetemperatureofthedrum.,Eddycurrentdynamometer1,ConceptsNREC2003,Experiencewiththisdynamometershowedthattoachievereliablerunningathighspeed,extremecarehadtobetakeninbalancingtherotatingassembly,obtainingadequatebearinglubrication,andcontrollingthedynamometerrotortemperature.,Eddycurrentdynamometer2,ConceptsNREC2003,Eddycurrentdynamometer3,ConceptsNREC2003,Theturbineshaftoutputpowerisabsorbedwithadirect-driveeddycurrentdynamometer,whichalsocontrolsthespeed.Theshaftisboredinordertoprovidethecapabilityforrotatingmeasurementsusinga100-channelslipring.Thedynamometerisratedat3,000hpat5,000to17,000rpm.Thedataacquisitionanddisplaysystemconsistsof512analogand576pressuremeasurementsusingESCORTDandanESPsystem.Slipringmeasurementsincludethermocouple,pressuretransducers,orstraingagesignals.Torqueoutputismeasuredusinganin-linetorquemeter.,NREC2003,NASAwarmturbinetestfacility,Concepts,Temperaturechange1,ConceptsNREC2003,PmDh0mCp(T01-T02)Accuratepowermeasurementusingtemperaturechangedatarequiresthattherigbecarefullyinsulatedtominimizestrayheattransfer.,Temperaturechange2,ConceptsNREC2003,
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- 关 键 词:
- 涡轮 增压 功率 测量