36··“L”型排风斜井对隧道烟气蔓延特性及排烟效率的影响研究王豫港赵江平（西安建筑科技大学资源工程学院，陕西西安710055）摘要为研究“L”型排风斜井对隧道烟气蔓延特性及排烟效率的影响，以某特长隧道为原型，使用PyroSim建立了特长公路隧道模型，采用数值模拟方法分析“L”型排风斜井在不同工况下对隧道内温度场、烟气场、排烟效率的影响。结果表明：排风斜井可有效降低隧道顶棚最高温升，顶棚最高温升与有效隧道高度的5/3次方呈负相关；斜井关闭时温度衰减速率大于开启时衰减速率，火源功率和衰减速率差值呈负相关；排风斜井开启，顶棚CO浓度未超过设计标准，有效降低人眼特征高度CO浓度，火源功率和CO纵向衰减速率呈正相关；“L”型排风斜井使隧道排烟效率显著提高。关键词“L”型排风斜井PyroSim烟气蔓延特性排烟效率Studyontheinfluenceof“L”exhaustinclinedshaftontunnelsmokespreadingcharacteristicsandsmokeex-haustefficiencyWANGYugangZHAOJiangping（CollegeofResourcesEngineering，Xi'anUniversityofArchitectureandTechnology，Xi'anShaanxi710055，China）AbstractInordertostudytheinfluenceof"L"typeexhaustinclinedshaftontunnelsmokespreadcharacteristicsandsmokeexhaustefficiency，asuperlonghighwaytunnelmodelisestablishedbyusingPyroSim，andtheinfluenceof"L"typeexhaustinclinedshaftontemperaturefield，smokefieldandsmokeexhaustefficiencyinthetunnelunderdif-ferentworkingconditionsisanalyzedbynumericalsimulationmethod.Theresultsshowthat：theexhaustrampcaneffectivelyreducethemaximumtemperatureriseoftheroofofthetunnel，themaximumtemperatureriseoftheroofisnegativelycorrelatedwiththeeffectivetunnelheightof5/3times;thetemperaturedecayratewhentherampisclosedisgreaterthanthedecayratewhenitisopened，andthedifferencebetweenthefirepoweranddecayrateisnegativelycorrelated;theexhaustrampisopened，theroofCOconcentrationdoesnotexceedthedesignstandard，effectivelyre-ducingtheCOconcentrationofthecharacteristicheightofthehumaneye，andthefirepowerandCOlongitudinalde-cayratearepositivelycorrelated;the"L"typeexhaustrampmakesthetunnelsmokeexhaustefficiencysignificantlyimproved.Keywords“L”exhaustinclinedshaftPyroSimsmokespreadingcharacteristicssmoke...
