電阻層析成像系統(tǒng)及兩相流測量的研究.pdf

1、隆到⑨天串大獸碩士學(xué)位論文學(xué)科專業(yè)：檢測技術(shù)與自動化裝置作者姓名：譚超指導(dǎo)教師：董峰教授ABSTRACTTwophaseflowisoneofthemostcolnlnonfluidsinthenaturewhichalsoplaysveryimportantpartinindustryanddailylifeBecauseofitscomplexityandvariabilitytherealtimeparametermeasurem

2、elltoftwo—phaseflowbecomesadifficultissueinthefieldofengineeringandscienceManymethodshavebeenappliedonmeasuringtwo—phaseflowtheonewithgreatperspectiveisElectricalResistanceTomography(ERT)whichcanobtaintheflowcharacterist

3、icoftwophaseflowbymeasuringthechangeoftheconductivityinthesensingfieldthatestablishedbyin3Iectingexcitingcurrentintomeasuredcross—sectionThecharacteristicofthistechniqueisnonintrusive，nonradiant，visualizationandetcThemai

4、nachievementsmadeinthisthesisareasfoItows：1TheserialdataacquisitionERTsystemisdesignedwitllinterfacecardandA／DtransitioncardBasingontheanalysisofreal—timeperformanceofERTsystem，theschemeofparalleldataacquisitionsystemhas

5、beenproposedThisnewsystemusesdigitalI／OcardandhighspeedA／Dtransitioncardtodecreasetheswitchtimeofmeasllredsignalandtoimprovesystemperformance2Combiningtheflowcharacteristicofgas／liquidtwophaseflowinhorizontalpipewiththeo

6、peratingprincipleofERTsystem，thefeaturetimeofgasphasepassingthrougheachpositionofthemeasuredcrosssectionisdrawnfromthetimeseriesoffeaturevalueofthemeasuredboundaryvoltagefromeachsensingelectrodeAlongwiththedistributionof

7、gasphaseinpipethesetwoparameterscanbeusedforfeatureextractionandrecognitionofflowregime3Thedual—planeERTsystemhasbeenadoptedfortheverticaltwo—phaseflowrealtimeexperimentsonoil／gas／waterthreephaseflowfacilityManygroupsofe

8、xperimentshavebeenmadewithdifferentseparationoftwosensingplanesThecross—correlationvelocityisdetainedbycorrelatingthefeaturevalueofmeasureddam，andassociatingwithdrift—fluxmodelandkinematictheorytherelationbetweenthecross