文档介绍：摘要摘要基于国内外地铁区间隧道火灾烟气流动与控制方面的研究现状,本文以广州地铁区间隧道作为研究对象,采用计算机数值模拟与现场实验相结合的方法,对地铁区间隧道火灾烟气的流动与控制规律进行了研究。在通用CFD程序的基础上,建立了地铁区间隧道火灾烟气流动的三维数学物理模型。以有限体积法为基础,采用浮升力修正的k—E湍流模型和SIMPLEST算法,将着火区域处理为体积逐时扩张的热源,对地铁区间隧道火灾自然排烟和机械排烟情形下的烟气特性、烟气分布和临界风速进行了详细的数值模拟研究,分析了隧道截面形状对临界风速和烟气分布的影响,得出了临界风速随火灾强度的变化关系曲线。并且,针对地铁区间隧道中部设置一个和两个联络通道的情形,提出了比较全面的地铁区间隧道火灾通风排烟和人员疏散模式,并对两种最复杂模式进行了详细的数值模拟研究,得出了针对这两种最复杂模式的最佳通风速度。结合广州地铁总公司的消防验收实验,对地铁区间隧道火灾进行了自然排烟和机械排烟的现场实验研究。分析了自然排烟情形下活塞竖井的烟囱效应对烟气流动扩散的影响,以及机械排烟情形下纵向通风对烟气的分层破坏情况,并最后将机械排烟现场实验研究结果与数值模拟结果进行了对比,验证了数值模拟结果的可靠性。数值模拟和现场实验的研究成果表明,本文建立的数学物理模型是合理而且可信的。研究成果不但为地铁隧道的防火和通风排烟系统的设计提供了直接的理论依据和指导,而且可以为地铁区间隧道火灾的烟气控制和人员疏散模式的选择提供了相关参考, 对以后进一步开展地铁区间隧道火灾与通风方面的研究有着重要的实用价值。关键词:地铁区间隧道;烟气特性;临界风速;烟囱效应;通风排烟模式 ABSTRACT ABSTRACT Based on the current situationofresearch on smoke movement andcontrol inthesubway tunnel atbroad and home,the methods ofnumerical simulation and spotexperiments areused tostudy thesmoke movement andcontrol lawsofGuangzhou subway tunnel. A three—dimensional mathematical andphysical modle ofsubway tunnel firesmoke movement isestablished based on thegeneral pute tothefinite volume method,a k—E model with buoyancy modifcation and SIMPLEST algorithm is used tostudy thesmoke traits,smoke distribution and the criticalvelocity numerically by treating thefire as avolumetric heatsource,and analyses theinfluence oftunnel section on thecriticalvelocity and smoke mutative relation curve ofcriticalvelocity and fireintensity tothesubway tunnel with or2cross—passages,prehensive ventilation and evacuation modes are gived,in which the most plicated modes are simulated detailedly,and theoptimal ventilation velocity areobtained. Combined with thefirechecking experiments ofGuangzhou pany,the spot experiments ofunartifical and mechanical smoke exhausting are satck—effecting ofpiston silo on thesmoke movement and diffusion atthesituation ofunartifical smoke exhausting,and thelongitudinal ventilation destroying the smo