城市公路隧道洞口污染物扩散数值模拟

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1、西南交通大学硕士学位论文城市公路隧道洞口污染物扩散数值模拟姓名：徐丽申请学位级别：硕士专业：供热、供燃气、通风及空调工程指导教师：冯炼20070601西南交通大学硕士研究生学位论文第2页AbstractItiswidelyusedaroadtu蛐elincitya．qextendedandcomplementofmadsystemonground'anditismoreimponant11latresearchaboutroadtunnelventilation．Butthemostresearchisfocusin【

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3、gzhouci哆jsresearchtarget．Accordingthistonnelactualsizetobuild3Dphysicalmathematicmodel，STAR——CDsoftwareisusedtorealizethree-dimensinnalsimulation．N-Sequationisgoverningequationofcomputationandk--Eturbulentmodelisemployed．Thefurltevolumemethodisusedtodiscretethec

4、omputedarea．Whendealingwiththeboundaryconditionintheareanearthewall．SIM瞳LEmethodisusedforsolving．Inthispaper,itissimulationthatcontaminatordiflusionlawindifferentexitvelocityfromtheroadtunnel．Comparinganalyzeofdifferemexitvelocityeffectconcentrationfield,andsugg

5、estthebestexitvelocity．AstypicalwoeconditionwhicharenormalventilatingWOrkconditionandianltrafficventilatingworkcondition,difierentseasonwindandseveraltypicaldirectionofwindeffectdiflusion．Itiscomparedwithcontaminationdistributionaboutsensitivelen91．hwisesectionw

6、hicharepavementandbuildingwhichpeoplelongexposure．Thronghtheseresearch,theWindeffectcontaininationdistribution,andknowtheareawhichiseasilysuper-standardandthedistributingregularofthe撇1nbcresearchresultsshowthatthecontaininatorwhichissatisfywithventilationstandar

7、dintunnelisOVerstandardintheareaaroundroadtunnelportal．Itisneededthatadoptsomewaytolowertheconcentrationinthearea．Soitissuggestthatbuildairshaftoropenaholeintunnel．‘Keywords：citytunnel；wind；distributingconcentration；numericalsimulation西南交通大学硕士研究生学位论文第1页第1章绪论1．1课

8、题研究背景随着中国经济的高速发展，中国的城市化水平正在快速提高，据统计预测：1996年末我国的城市化水平已达到28．9％至2000年将达到35％，城市化水平提高的必然结果为城市规模的扩大，城市人口超饱和，建筑空间拥挤，城市绿化减少。我国北京、上海、广州等超大型城市位于世界人口高密度城市之前列，但是由于我国国情影响下我国城市大多为粗