Title of article
NumericalanalysisofsupercriticalflowinstabilitiesinanaturalcirculationloopOriginalResearchArticle
Author/Authors
PrashantK.Jain، نويسنده , , Rizwan-uddin، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
11
From page
1947
To page
1957
Abstract
NumericalstudieshavebeencarriedouttoinvestigateflowinstabilitiesinanaturalcirculationloopwithsupercriticalCO2.Forsteady-stateanddynamicanalysesoftheloopundersupercriticalconditions,asingle-channel,one-dimensionalmodelisdeveloped.Inthismodel,equationsfortheconservationofmass,momentumandenergyarediscretizedusinganimplicitfinitedifferencescheme.Acomputercodecalledflowinstabilityanalysisundersupercriticaloperatingconditions(FIASCO)iswritteninFORTRAN90tosimulatethedynamicsofnaturalcirculationloopswithsupercriticalfluid.Stabilityboundariesaredeterminedbysimulatingtheloopʹstimeevolutionfollowingasmallperturbationunderdifferentoperatingconditions.Stabilitythresholdresultssubstantiallydeviatefromtheresultsreportedbypreviousinvestigators,andcontradictsomeofthereportedfindings.Thedisagreementinresultsismostlikelyduetotheundesirabledissipativeanddispersiveeffectsproducedfromthelargetimestepsusedinpreviousstudies,therebyleadingtoalargerstableregionthanthosefoundusingsmallertimesteps.Resultspresentedinthispapersuggestthatthestabilitythresholdofanaturalcirculationloopwithsupercriticalfluidisnotconfinedtothenear-peakregionofthe(steadystate)flow-powercurve.Resultsobtainedfortherangeofparametervaluesusedinthisinvestigationalwayspredictthestabilitythresholdtobeinthepositivesloperegionofthe(steadystate)flow-powercurve.Parametricstudiesfordifferentoperatingconditionsrevealthesimilarityofstabilitycharacteristicsofflowundersupercriticalconditionswiththoseintwo-phaseflows.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2008
Journal title
Nuclear Engineering and Design Eslah
Record number
895149
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