ingandseparatingmethod
atract
gas-liquidtwo-phaseflowsarecommoninthepetroleum、chemicalandpowerindustries，butthemeasurementoftheirflowratearestilladifficultprobleminengineering．inrecentyears，withtherapiddevelopmentofmodernengineeringproject，thisproblembecomemoreurgenttosolve，agreatdealofinvestmentsthroughouttheworldhavebeenmadetodevelopthiskindofflowrateitruments．theobjectiveofthisthesis,financiallysuortedbythenationalnaturalsciencefoundationofchinakeyproject（59995460），ist
oresearchanddevelopnewmeasurementmethodsoftwo-phaseflow,andthemethodsinventedinthispaperhavebeengrantedtobechinesepatents．
inthefirstpartofthethesis,areviewofthepriorartsoftwophaseflowmeasurementwasmade,andtheseartscanbeclaifiedasseparationmethodandnon-separatingmethod,dependingonwhetherthetwophasemixtureisseparatedintheproceofmeasurement.intraditionalseparationmethod,alargeseparatorisalwaysemployedtoseparatethegas-liquidmixturefirst,andthenmetertheflowrateofeachphasewithconventionalsinglephaseflowmeters.thissolutionoffersdefiniteadvantages,suchasmeteringreliabilityandflowregimeindependent.usuallytheseparationequipmentisverylargeandexpeive,andsomeecialpipelinesandmeteringstatioalsohavetobebuilt.thepartialflowseparationmethod,developedinrecentyears,partiallyseparatethetwophasemixtureintopredominantlyliquidandpredominantlygasstreamsbeforemeasuringwithtwo-phaseflowmeters.althoughtheseparatorcanbereducedinsizeandeachflowstreamonlyneedstobemeasuredoveralimitedrangeofcomponentfraction,theimprove
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