虹吸管道非穩(wěn)態(tài)多相流數(shù)值模擬與試驗(yàn)研究

虹吸管道非穩(wěn)態(tài)多相流數(shù)值模擬與試驗(yàn)研究摘要：本研究通過數(shù)值模擬和試驗(yàn)研究，對(duì)虹吸管道的非穩(wěn)態(tài)多相流特性進(jìn)行了分析和探討。針對(duì)虹吸管道中的氣液兩相流動(dòng)問題，采用歐拉-拉格朗日方法建立了數(shù)值模型，通過計(jì)算流場(chǎng)各項(xiàng)指標(biāo)得到了流動(dòng)特性和壓力變化規(guī)律。同時(shí)，本文還構(gòu)建了針對(duì)虹吸管道氣液兩相流的實(shí)驗(yàn)?zāi)M平臺(tái)，并進(jìn)行了一系列試驗(yàn)。試驗(yàn)結(jié)果顯示，虹吸管道中液位高度、管道角度、管徑以及進(jìn)口液體流量對(duì)虹吸效應(yīng)均有較大影響，其中液位高度和管道角度的影響最為顯著。通過對(duì)比數(shù)值模擬和試驗(yàn)結(jié)果，驗(yàn)證了模型的可靠性和精度，得到了更加準(zhǔn)確的多相流動(dòng)特性和虹吸效應(yīng)規(guī)律。本文的研究結(jié)果不僅可為虹吸式液體輸送系統(tǒng)的設(shè)計(jì)和優(yōu)化提供理論支持，還對(duì)多相流動(dòng)問題的深入研究和應(yīng)用具有一定的參考意義。

關(guān)鍵詞：虹吸管道；非穩(wěn)態(tài)多相流；歐拉-拉格朗日方法；數(shù)值模擬；試驗(yàn)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