涡轮增压器的流量测量PPT课件下载推荐.pptx
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ConceptsNREC,FlowMeasurement,NickBainesConceptsNREC,Othermeterscomprisearangeofdevices.Mostofthesealsomeasuretheflowrateindirectlyviathedragforceonanimmersedbody,workdoneonaturbine,orachangeintheelectricaloracousticpropertiesofthemedium.Onlyvolumetricflowmetersofthepositivedisplacementtypemeasuretheflowratedirectly,anddonotfindmuchapplicationinturbomachinery.Othertypesofflowmetermustbecalibratedindividually.,ConceptsNREC2,003,Flowmeasuringdevices1,FlowMeasurement,ConceptsNREC2003,Flowmeasuringdevices2,FlowMeasurement,ConceptsNREC2003,Restrictionflowmeters,Venturimeter,FlowMeasurement,Flownozzles,PressuresmustbemeasuredateitherDandD/2tapsoratflangetaps.Thesemustnotbemixedandtheprescribedmeasuringlocationsmustbeadheredto.Ateachpointthepressureshouldbemeasuredatseveralcircumferentiallocationstogiveareliableaverage.,ConceptsNREC2003,Orificeflowmeter,FlowMeasurement,ConceptsNREC2003,Orificepressureloss,FlowMeasurement,ConceptsN,REC2003,Orificeornozzleflowmeter,FlowMeasurement,ConceptsNREC2003,Minimumpipelengths,FlowMeasurement,ConceptsNREC2003,Venturimeter,FlowMeasurement,Calibrationandchecking,Buildrestrictionflowmeterstostandards(e.g.ASME,HEI,BS)andusepublishedcalibrationsRequiresverycarefuldesignandinstallationAccuracyis12%atbestHavethemetercheckedatastandardslaboratory(e.g.NBS)ThestandardistraceableincaseguaranteesarerequiredExpensiveandtime-consumingDotheinletandexitarrangementsinthestandardslabreplicatethoseofthetestrig?
@#@Accuracyis0.5%ConceptsNREC2003,FlowMeasurement,