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1、消防理论研究Contributiontothecontroloffire-inducedsmokeflowinlongitudinallyventilatedtunnels111STEPHANEGAILLOT,ALISTAIRREVELL,DOMINIQUEBLAY,23JEAN-PIERREVANTELON,PASCALDEBERTEIX(1.Laboratoired'EtudesThermiques,UMRCNRS6608EcoleNationaleSuprieuredeMcaniqueetd'Ar
2、otechniqueUniversityofPoitiers1avenueClmentAderBP40109-86961FuturoscopeChasseneuil,France;2.LaboratoiredeCombustionetdeDtonique,UPRCNRS9028EcoleNationaleSuprieuredeMcaniqueetd'ArotechniqueUniversityofPoitiers1avenueClmentAderBP40109-86961Futuroscope^Chas
3、seneuil,France;3.RATPControleGnraldeScurit/ScuritIncendie105BoulevarddeChanzy93100Montreuil,France)Abstract:ThisworklooksatthelongitudinalventilationofRi——richardsonnumber;firesinatunnelandtheassociatedphenomenonofbacklayerT——temperature,K;formation.Comp
4、utationalFluidDynamicsareusedtosimulateTref——referencetemperature,K;theflowandtogivepredictionsthatcanbecomparedwithTo——ambienttemperature,K;experimentaldata.FocusinginupontheuseofRichardsonnumber,differentreferencetemperaturesareinvestigatedandu——longit
5、udinalventilationvelocity,m/s;itisfoundthatusingatemperaturecalculateddirectlyfromthev——velocitycomponentinydirection,m/s;heatreleaserateofthefirewillyieldthemostusefulresults.x——longitudinalcoordinate,m;Experimentalresultsarecomparedtothenumericalpredic
6、tiony——verticalcoordinate,m;showingareasonablelevelofagreement.TheuseofaQ——density,kg/m3。volumetricheatsourcetomodelthefireisalsovalidated.SubscriptsThataccuracyoftheresultsdependsheavilyonheattransferc——criticaltothewallandroof,isevidenced.sc——supercrit
7、icalFinally,thebasicrequirementofanyscaleexperimentbeingthatitsresultsaretransferabletoreal-worldcaseitistryingto1Introductionrepresent,theexistenceofaSuperCriticalVentilationOnlyoverthelasttwodecadeshasmuchattentionVelocityof≈3m/s,independentofthepowero
8、fthefire,beenpaidtothedangeroftunnelfires.Beforethis,abovewhichallthesmokesproducedarepusheddownstream,thedesignofatunnelventilationsystemwasbasedisverified.onthefreshairrequiredtomaintainacceptableairKeywords:tunnelfire;l
