第18卷增刊2地下空间与工程学报Vol.182022年12月ChineseJournalofUndergroundSpaceandEngineeringDec.2022大万山斜井送排通风隧道火灾烟气控制数值研究付孝康1,曾艳华2,陶亮亮2(1.山西静兴高速公路有限公司,山西吕梁033500;2.西南交通大学交通隧道工程教育部重点实验室,成都610031)摘要:为探究机械通风和火源位置对送排式通风隧道火灾特征参数的影响,基于FDS研究了火灾后隧道内烟气、温度和速度分布情况。结果表明:相同火源热释放速率下纵向风速是影响火源上游烟气逆流长度的关键因素,火源位置和斜井排烟风量对火源上游烟气蔓延影响很小;随着纵向风速的增大斜井下游烟气蔓延长度增加,因此纵向风速不宜大于3.0m/s,此时火源上游烟气逆流长度仅为20m;相同通风条件下,火源位置主要影响烟气流经斜井处的温度,进而影响火源下游烟气分布;火源与斜井距离越小,相同排烟风量下斜井下游烟气蔓延长度越长,控制斜井下游烟气蔓延的排烟量越大。关键词:隧道火灾;机械通风;火源位置;烟气控制;温度分布;流场中图分类号:X928.7文献标识码:A文章编号:1673-0836(2022)增2-1023-07NumericalStudyonSmokeControlofDawanshanInclinedShaftVentilationTunnelFuXiaokang1,ZengYanhua2,TaoLiangliang2(1.ShanxiJingxingExpresswayCo.,Ltd.,Lüliang,Shanxi033500,P.R.China;2.KeyLaboratoryofTransportationTunnelEngineering,MinistryofEducation,SouthwestJiaotongUniversity,Chengdu610031,P.R.China)Abstract:Inordertoexploretheinfluencesofmechanicalventilationandfiresourcelocationonfirecharacteristicparametersofacombinedventilationtunnel,thedistributionofsmoke,temperatureandvelocityintunnelafterfirewasstudiedbasedonFDSnumericalsimulation.Theresultsshowthat:thelongitudinalvelocityisthekeyfactoraffectingtheupstreamsmokebake-layeringlengthunderthesameheatreleaserate.Thelocationofthefiresourceandtheexhaustairvolumeofinclinedshafthavelittleinfluenceonthesmokespreadupstreamofthefiresource.Withtheincreaseoflongitudinalvelocity,thesmokespreadlengthdownstreamoftheinclinedshaftincreases,sothelongitudinalvelocityshouldnotbegreaterthan3.0m/s.Atthistime,thespreadlengthofsmokeupstreamofthefiresourceisonly20m.Underthesameventilationconditions,thelocationofthefiresourcemainlyaffectsthetemperatureofthesmokeflowi...
