商用飞机火灾模拟

商用飞机火灾模拟CD-adapco2017.2.22,Realizeinnovation.,RestrictedSiemensAG2017,.,商用飞机火灾事故分析,客舱灭火案例,StecklerRoom火灾案例验证,Star-CCM+火灾分析工具,.,商用飞机火灾事故分析,客舱灭火案例,StecklerRoom火灾案例验证,Star-CCM+火灾分析工具,部分飞机火灾事故,部分飞机火灾事故,2002年北方航空公司MD82大连坠海事故2002年5月7日21时24分，北方航空公司的一架客机在大连海域失事，机上103名乘客、9名机组人员全部罹难。这一空难事故被称为大连57空难。向塔台报告客舱失火，随后飞机失控坠海。最终调查结果为乘客纵火造成的破坏事件。,部分飞机火灾事故,部分飞机火灾事故,部分飞机火灾事故,商用飞机发动机火灾事故起因分析,据美国交通运输安全委员会（NSTB）统计，从1983年至2000年，各类民用飞机发动机火灾事故达2528起，主要火灾成因如下：,发动机火区划分,.,商用飞机火灾事故分析,客舱灭火案例,StecklerRoom火灾案例验证,Star-CCM+火灾分析工具,BuoyantflamesareofinterestinmanysafetyrelatedapplicationsIncludingtheeffectofgravityisimportantHeatfluxtoobjectsatvariousdistancesfromthefireisoftenstudied,模拟关键点,Thenearnear-fieldshouldbemorerefinedthanfar-fieldBothtrimandpolycellsworkwellSomeinitialvolumetricrefinementisrequiredafterwhichthemeshcanbefurtherrefinedusingfieldfunctionbasedmethod,浮力羽流火源网格细化,STAR-CCM+canhandlethermalandfireplumesusingURANSaswellasLESFireandSmokewizardcanbeusedwhenonewantstomodelfireasasimpleheatsourceLESrequiresfinermeshesandsmallertime-stepsbutbettercapturethesmallscaleflowfeatures,BuoyantFlames,ResultsfromtheFireandSmokewizard,TemperatureatDoorway,VelocityatDoorway,Temperatureandvelocityprobesalongtheentryway,MeshSize:56KTime-step:1secondTurbulenceModel:Standardk-EpsilonCombustionModel:None.Heatsourceapproximation,TemperatureatDoorway,VelocityatDoorway,MeshSize:542KTime-step:0.1secondsTurbulenceModel:RealizableK-EpsilonCombustionModel:PPDFEquilibrium,ResultsfromtheFireandSmokewizard,MeshSize:542KTime-step:0.002secondsTurbulenceModel:WALECombustionModel:PPDFEquilibrium(URANSsolutionat400sasinitialconditionSamplingtime:500-600seconds),MeanTemperatureatDoorway,MeanVelocityatDoorway,ResultsfromtheFireandSmokewizard,.,商用飞机火灾事故分析,客舱灭火案例,StecklerRoom火灾案例验证,Star-CCM+火灾分析工具,DesigningthesystemisdifficultNozzletype,placement,suppressantconcentration,etc.EspeciallyinaclutteredvolumeSimulationisacost-savingtooltoevaluateandoptimizethedesignbeforetest&buildSTAR-CCM+isuniquelysuitedforthissimulation:ComplicatedgeometriesBuoyancy,turbulence,liquid&solidparticles,etc.FuelcombustionSuppressionchemistryGenerationandtransportoftoxicgasesEtc.,灭火系统模拟难点,CFDValidationofFireSuppressionSimulation,UNCLASSIFIED:DistributionStatementA.Approvedforpublicrelease.,ExploratoryTestBoxVolumesimilartocombatvehiclecrewcompartmentDoesnotrepresentanyparticularvehicleFireballissimulatedbysurrogatefuelforJP-8InjectorsmatchobservedtestspraypatternSuppressantisdischargedafter50ms七氟丙烷+碳酸氢钠,ExploratoryTestBox:GeometryandMesh,Successfulextinguishwithnore-flash,ExploratoryTestBox:TransientVisualization,Blue:HeptafluoropropaneLiquidparticlesw/evaporationGray:SodiumbicarbonateSolidparticlesw/devolatizationandcombustionreactions,Goodmatchwithtestfor“abovedesignconcentration”case(successfulsuppression)Qualitativeagreementwithtestfor“belowdesignconcentration”case(failedsuppression),ExploratoryTestBox:Results,SuccessfulSuppressionCase,FailedSuppressionCase,Simulationproperlypredictssuppressionpass/failduetonozzleconfiguration.,CrewCompartment:NozzleConfiguration,Nozzle1:FailedSuppressi