应用电阻层析成像与相关测量技术测量两相流参数

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1、天津大学硕士学位论文应用电阻层析成像与相关测量技术测量两相流参数姓名：乔旭彤申请学位级别：硕士专业：检测技术与自动化装置指导教师：徐立军;董峰20030101AbstractThegas/liquidtwo-phaseflowisverytypicalinnatureandindustrialapplications,andmeasurementofitsparametersisalwaysdesiredforindustrialandacademicuse.Focusinguponthegasphas

2、einagas/liquidflow,thispapercombinedtheElectricalResistanceTomographywiththeCrossCorrelationTechniquetogiveanestimateofthegas'sflowrate,anddiscussedindetailstheproject,thetheoryandsomekeycomponentswhenputingthemethodintopracticeThespecificworkthattheauth

3、orhasfinishedinthisresearchisasfellows:1.Theoreticalanalysesandapplicationdetailswereintroducedaroundmeasurementofthegas'sflowratewiththeERTtechniqueandtheCross-Correlationtechnique.Specificdesigningwascompletedonthesensors'distanceandtheworkingstyleofth

4、esamplingunit,andthreedimensionefectoftheelectricfieldinsidethepipewasdiscussedaswell.2.Anewmethodforestimatingthevoidfractionofgas/liquidflowswasputforwardwhichisbasedontheeigenvalueofsampledvoltagedata.FiniteElementMethodandsomeexperimentswereadoptedto

5、demonstratethefactorsinfluencingtheflow'svoidfraction,andthequantityrelationbetweenvoidfractionandsampledvoltageswasacquiredultimately.3.A120-pixelcross-correlationalgorithmwasaccomplishedwhichisbaseduponSensitivityCoeficientAlgorithm-animagereconstructi

6、onalgorithmusedinERTThevelocitydataacquiredbythe120-unitpixel-correlationmethodwasalsoprocessedtoprovideaprofileofthegas'smoving,andsomeelementarymethodwascarriedontooptimizetheprofile'sefect4.Combinationoftheeigenvalueofthesampledvoltagesandcross-correl

7、ationalgorithmwasachievedtomeasurethegas'sflowrate5.Twoexperimentswereplannedtoevaluatethevalidityandrobustnessofthosetwomethods.Experimentsresultswerecarefullycomparedtoanalyzetheircharactersrespectively.Itcanbeconcludedthatthepixel-correlationmethodpro

8、videsrelativelyabundantresultsandcanmakeestimationmoreaccuratethanthatoftheeigenvalue-correlationmethod.Whiletheeigenvalue-correlationmethodhassuchadvantagesthatitcanberealizedeasilyandcanprocessthedatainashortertime.Espec