京沪高铁隧道洞门对隧道空气动力效应影响的研究的中期报告-第一文库 | 海量文档资源下载与分享平台

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京沪高铁隧道洞门对隧道空气动力效应影响的研究的中期报告AbstractInthisreport,themid-termfindingsofaresearchprojectontheaerodynamiceffectoftunnelportaldoorsontheairflowinsidetunnelsarepresented.TheprojectfocusesonthesectionoftheBeijing-Shanghaihigh-speedrailwaytunnelthatisequippedwithportaldoors.Thereportsummarizesthepreviousliteratureontunnelaerodynamics,describestheinvestigationmethodologyandreportsontheinitialsimulationresults,includingthepressuredistributiononthedoorsandtheairflowthroughthetunnelbeforeandaftertheinstallationofthedoors.Thefindingssuggestthattheportaldoorsinducecomplexchangesintheairflowandpressuredistributioninsidethetunnelandshouldbetakenintoaccountintunnelventilationsystemdesign.IntroductionTheBeijing-Shanghaihigh-speedrailway(BSHSR)isoneofthebusiestrailwaysintheworld,coveringadistanceof1,318kilometersbetweenBeijingandShanghai.Therailwayusesnumeroustunnels,includingsomeofthelongestanddeepesttunnelsinChina.Toenhancethesafetyandcomfortofthepassengers,theBSHSRtunnelsectionsareequippedwithportaldoorsateachend.Thedoorsaredesignedtoprotectthetunnelsfromwaterintrusionandreducethepressurewavegeneratedbyatrainenteringorexitingthetunnel.However,theimpactofthesedoorsontheaerodynamicperformanceofthetunnelisnotfullyunderstood.Theinstallationofthedoorsmayaffecttheairflowinsidethetunnel,includingtheairexchange,thepressuredistribution,andtheairquality.Therefore,theaimofthisresearchprojectistoinvestigatetheaerodynamiceffectsofthetunnelportaldoorsontheairflowinsidethetunnel.LiteratureReviewTheliteratureontunnelaerodynamicsisvastandcoversvariousaspectsoftunnelventilationandaerodynamics.Somestudieshavefocusedontheimpactofdifferenttunnelgeometryontheairflow,whileothershavestudiedtheairflowthroughopenings.Severalstudieshavealsoinvestigatedtheeffectofportaldoorsontheairflowandpressuredistributioninsidetunnels.Forexample,Zhouetal.(2013)investigatedtheimpactofportaldoorsontheairflowandpressuredistributioninsidetheXintaiTunnelusingnumericalsimulations.Theyfoundthattheinstallationofportaldoor