【英文标准名称】:GasFlowbyMeansofCriticalFlowVenturiNozzles,Measurementof
【原文标准名称】:利用临界文氏流量喷嘴测量气体流量
【标准号】:ANSI/ASMEMFC-7M-1987
【标准状态】:现行
【国别】:美国
【发布日期】:1987
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ASME
【标准类型】:()
【标准水平】:()
【中文主题词】:流量测量
【英文主题词】:Flowcalculation;Flowmeasurements;Flowmeasuringtechniques;Gasflow;Gases;Massflowrates;Maximumvalue;Methodsformeasuring;Metric;Nozzleflowmeters;Nozzles;Venturimeters;Venturinozzles
【摘要】:ThisStandardappliesonlytothesteadyflowofsingle-phasegasesanddealswithdevicesforwhichdirectcalibrationexperimentshavebeenmade,sufficientinnumberandquantitytoenableinherentsystemsofapplicationstobebasedontheirresultsandcoefficientstobegivenwithcertainpredictablelimitsofuncertainty.Thecriticalflowventurinozzlesdealtwithcanonlybeusedwithinlimitsthatarespecified,forexamplenozzlethroattoinletdiameterratioandReynoldsnumber.ThisStandardspecifiesthegeometryandmethodofuse(installationandoperatingconditions)ofcriticalflowventurinozzlesinsertedinasystemtodeterminethemassflowrateofthegasflowingthroughthesystem.Italsogivesnecessaryinformationforcalculatingtheflowrateanditsassociateduncertainty.ThisStandardappliesonlytoventurinozzlesinwhichtheflowiscritical.Criticalflowexistswhenthemassflowratethroughtheventurinozzleisthemaximumpossiblefortheexistingupstreamconditions.Atcriticalfloworchokedconditions,theaveragegasvelocityatthenozzlethroatcloselyapproximatesthelocalsonicvelocity.InformationisgiveninthisStandardforcasesinwhich:(a)thepipelineupstreamoftheventurinozzleisofcircularcrosssection;or(b)itcanbeassumedthatthereisalargespaceupstreamoftheventurinozzle.TheventurinozzlesspecifiedinthisStandardarecalledprimarydevices.Otherinstrumentsforthemeasurementareknownassecondarydevices.ThisStandardcoversprimarydevices;secondarydeviceswillbementionedonlyoccasionally.
【中国标准分类号】:A50
【国际标准分类号】:17_120_10
【页数】:
【正文语种】:英语