虹吸管道非稳态多相流数值模拟与试验研究

虹吸管道非稳态多相流数值模拟与试验研究摘要：本研究通过数值模拟和试验研究，对虹吸管道的非稳态多相流特性进行了分析和探讨。针对虹吸管道中的气液两相流动问题，采用欧拉-拉格朗日方法建立了数值模型，通过计算流场各项指标得到了流动特性和压力变化规律。同时，本文还构建了针对虹吸管道气液两相流的实验模拟平台，并进行了一系列试验。试验结果显示，虹吸管道中液位高度、管道角度、管径以及进口液体流量对虹吸效应均有较大影响，其中液位高度和管道角度的影响最为显著。通过对比数值模拟和试验结果，验证了模型的可靠性和精度，得到了更加准确的多相流动特性和虹吸效应规律。本文的研究结果不仅可为虹吸式液体输送系统的设计和优化提供理论支持，还对多相流动问题的深入研究和应用具有一定的参考意义。

关键词：虹吸管道；非稳态多相流；欧拉-拉格朗日方法；数值模拟；试验研究

Abstract:Inthisstudy,thecharacteristicsofunsteadymultiphaseflowinsiphonpipelineswereanalyzedanddiscussedthroughnumericalsimulationandexperimentalresearch.Fortheproblemofgas-liquidtwo-phaseflowinsiphonpipelines,anumericalmodelwasestablishedusingtheEuler-Lagrangemethod,andtheflowcharacteristicsandpressurechangeswereobtainedbycalculatingvariousflowfieldindicators.Atthesametime,thispaperalsoconstructedanexperimentalsimulationplatformforgas-liquidtwo-phaseflowinsiphonpipelinesandconductedaseriesofexperiments.Theresultsshowedthattheliquidlevelheight,pipelineangle,pipediameter,andinletliquidflowrateallhadasignificantimpactonthesiphoneffectinthesiphonpipeline,ofwhichtheliquidlevelheightandpipelineanglehadthemostsignificantimpact.Bycomparingthenumericalsimulationandexperimentalresults,thereliabilityandaccuracyofthemodelwereverified,andmoreaccuratemultiphaseflowcharacteristicsandsiphoneffectlawswereobtained.Theresearchresultsofthispapercannotonlyprovidetheoreticalsupportforthedesignandoptimizationofsiphonliquidtransportationsystemsbutalsohavecertainreferencesignificanceforthein-depthstudyandapplicationofmultiphaseflowproblems.

Keywords:siphonpipeline;unsteadymultiphaseflow;Euler-Lagrangemethod;numericalsimulation;experimentalresearchThesiphoneffectisawidelyusedprincipleinmanyliquidtransportationsystems.Toensurethesafeandefficientoperationofthesesystems,itisessentialtothoroughlyunderstandtheflowcharacteristicsandsiphoneffectinmultiphaseflow.Inthisstudy,theunsteadymultiphaseflowbehaviorinasiphonpipelinewasinvestigatedusingtheEuler-Lagrangemethodandvalidatedbyexperimentalresearch.

ThenumericalsimulationwasconductedbysolvingtheNavier-Stokesequationsfortheliquidphaseandthekinematicequationsforthegasphase.ThegoverningequationswerediscretizedusingafinitevolumemethodandsolvedusingtheSIMPLEalgorithm.TheLagrangianparticletrackingmethodwasusedtosimulatethemovementofparticlesinthegasphase.

Onthebasisofnumericalsimulation,themultiphaseflowcharacteristicsofthesiphonpipelinewereanalyzed.Thepressuredistributionandvelocitydistributionoftheliquidphasewereobtained.Thesiphoneffectwasobservedtobestronglyinfluencedbythecharacteristicsofthemultiphaseflow.Theresultsindicatedthatthegas-liquidinterfacewasunstableduetotheinteractionbetweenthephases,whichledtoafluctuationinthepressureandvelocityoftheliquidphase.

Inaddition,theexperimentalresearchwasconductedtoverifytheaccuracyofthenumericalsimulationresults.Thetransientpressureandliquidflowrateweremeasuredatdifferentpositionsinthesiphonpipeline.Theexperimentalresultswereingoodagreementwiththenumericalsimulationresults,indicatingthatthenumericalsimulationmethodwasreliableforanalyzingthemultiphaseflowbehaviorinthesiphonpipeline.

Basedontheresearchresults,moreaccuratemultiphaseflowcharacteristicsandsiphoneffectlawswereobtained.Thesefindingscanprovidevaluableguidanceforthedesignandoptimizationofsiphonliquidtransportationsystems.Moreover,theresearchresultshavecertainreferencesignificanceforthein-depthstudyandapplicationofmultiphaseflowproblemsInaddition,theresearchalsohighlightedsomepotentialchallengesthatcouldariseinsiphonpipelinesystems.Forexample,theflowpatternandpressuredropofthegas-liquidmixtureinthepipelinemaychangeduetofactorssuchaschangesinfluidcomposition,pipelinegeometryorambienttemperature.Therefore,itisimportanttoconsiderthesefactorsduringthedesignandoperationofsiphonpipelines.

Moreover,theresearchshowedthatthepressuredistributionalongthesiphonpipelinewasuneven,withahigherpressuredropoccurringinthedownwardbranchofthepipelinethanintheupwardbranch.Thiscouldleadtolowerflowratesandpressuredropsthanpredictedintheupwardbranch,andhigherthanpredictedinthedownwardbranch.Thus,itisnecessarytoconsiderthesepressureimbalanceswhendesigningandoperatingsiphonpipelines.

Inconclusion,theresearchonmultiphaseflowbehaviorinsiphonpipelineshasprovidedvaluableinsightsintotheflowcharacteristicsandsiphoneffectlawsofthesesystems.Thesefindingsarecrucialinoptimizingthedesignandoperationofsiphonpipelinestoensurepropertransportofliquidsoverlongdistances.Futureresearchcouldfocusonaddressingthechallengesandlimitationsofthesesystems,particularlyinimprovingthepressuredistributionandminimizingthepressurelossesduringoperationThereareseveralareasforfutureresearchonsiphonpipelines,particularlyonthechallengesandlimitationsofthesesystems.

Oneaspectthatneedstobeaddressedisthepressuredistributionalongthepipeline.Insiphonpipelines,pressureimbalancescanoccurduetotheunevendistributionoffluidpropertiesorachangeindirection.Thesepressureimbalancescancauseflowinstabilitiesandreducetheefficiencyofthesystem.Therefore,futureresearchcouldinvestigatetechniquestoimprovethepressuredistributionalongsiphonpipelines,suchasbyincorporatingpressureequalizationchambersordevelopingbetterflowcontrolmechanisms.

Anotherareaofresearchisonminimizingpressurelossesduringoperation.Frictionallossesoccurinallpipelinesandcannegativelyimpacttheperformanceofthesystem.Insiphonpipelines,theselossescanoccurindifferentwaysdependingontheflowregime,suchasviscosityeffectsorfluidseparation.Futureresearchcaninvestigatewaystoreducefrictionallossesinsiphonpipelines,suchasbyoptimizingthepipediameter,improvingthefluidproperties,ordevelopingnovelcoatingmaterialstoreducefriction.

Moreover,researchcouldfocusonunderstandingtheinteractionsbetweenmultiphaseflowbehaviorandsiphonpipelines.Themovementofmultiphasefluidsiscomplexandcancauseunexpectedbehaviorinsiphonpipelines,suchasflooding,gasentrainment,orslugflow.Therefore,futureresearchcouldexploretherelationshipbetweenmultiphaseflowbehaviorandsiphonpipelinestodevelopmoreaccuratemodelsanddesigncriteriaforthesesystems.

Lastly,thereisaneedtoinvestigatetheenvironmentalimpactofsiphonpipelines.Whilesiphonpipelinescanofferacost-effectiveandefficienttransportsolution,theycanalsohavenegativeimpactsontheenvironment,suchasalteringwaterecosystemsorreleasingpollutantsintothewater.Futureresearchshouldaimtoquantifyandmitigatetheseenvironmentalimpactstoensuresustainableuseofsipho