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Large eddy simulation of unsteady flow in gas–liquid separator applied in thorium molten salt reactor

【摘要】Axialgas–liquidseparatorshavebeenadoptedinfissiongasremovalsystemsforthedevelopmentofthoriummoltensaltreactors.Inourpreviousstudy,weobservedanunsteadyflowphenomenoninwhichtheflowpatternisdirectlydependentonthebackpressureinagas–liquidseparator;however,theunderlyingflowmechanismisstillunknown.Inordertomoveastepfurtherinclarifyinghowtheflowpatternevolveswithavariationinbackpressure,alargeeddysimulation(LES)wasadoptedtostudytheflowfieldevolution.Inthesimulation,anartificialboundarywasappliedattheseparatoroutletundertheassumptionthatthebackpressureincreaseslinearly.ThenumericalresultsindicatethattheunsteadyflowfeatureiscapturedbytheLESapproach,andtheflowtransitionismainlyduetotheaxialvelocityprofileredistributioninducedbythebackpressurevariation.Withtheincreaseinbackpressure,theaxialvelocitynearthedownstreamorificetransitsfromnegativetopositive.Thischangeintheaxialvelocitysignforcestheunstablespiralvortextobecomeastablerectilinearvortex.

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254 共9页 核技术:英文版 2018年5期 免费 中文科技期刊数据库

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