摘要:外墙外保温火灾发生后,窗口成为火焰进入室内的通道并提供大量的空气,可能导致室内发生轰然。为了研究高层住宅窗墙比对火势的蔓延速率、火场温度、烟气蔓延程度和一氧化碳浓度变化的影响,本文采用了场模拟软件FDS (Fire Dynamics Simulator),模拟了不同窗墙比情况下的住宅外墙外保温火灾,分析得到窗墙比增大后,火灾蔓延速率变快,蔓延范围增大,但峰值温度降低。模拟结果表明,起火面窗墙比为0.25时燃烧剧烈,引起轰然,形成瞬间高温;起火面窗墙比为0.35 时,因为对流加强,热损失增大,温度降低。本文的研究成果可为高层住宅外保温层火灾安全设计和管理提供有益的参考。24073
毕业论文关键词:窗墙比;高层住宅;外墙外保温火灾;FDS;烟气蔓延
Research on Impact of High-rise residential Exterior insulation Fire with Different Window-Wall Ratio
Abstract:The fire of external wall insulation, windows into the flame into the interior of the channel and to provide a large amount of air, can cause indoor crashing. In order to spread of high-rise residential window wall ratio, the effect of temperature, rate of fire smoke spreading and carbon monoxide concentration changes, the field simulation software FDS (Fire Dynamics Simulator), the simulation of different window wall ratio in the case of the residential exterior insulation fire, analysis by the window wall ratio increases, the fire spread rate faster, spread range increases, but reduce the peak temperature. The simulation results show that, the fire side window wall ratio is 0.25 when burning, caused by crashing, formation of instantaneous high temperature; fire area ratio of window to wall is 0.35, because the convection heat loss increases, strengthen, lower temperature. To provide the beneficial reference layer of fire safety design and management of the research results of this paper can be for high-rise residential exterior insulation.
Key words: Window-wall Ratio, High-rise Residential Building, Exterior Insulation Fire, FDS,The spread of smoke
目录
1.绪论 1
1.1 课题研究背景和意义 1
1.2 国内外研究现状 1
1.3 本文的研究内容和方法 3
2. 高层建筑火灾分析的理论基础 5
2.1 火灾动力学基础 5
2.2.1火灾发展过程 5
2.1.2火灾发展机理 5
2.1.3火源参数及其确定方法 6
2.2 FDS数值模拟理论及方法 9
2.2.1FDS软件简介 9
2.2.2FDS数值模拟的理论基础 9
2.2.3主要参数设置 10
2.3 高层建筑外保温层火灾特点 12
2.3.1火灾发生率高 12
2.3.2火势蔓延快 12
2.3.3疏散困难 12
3. 高层住宅外保温层火灾数值模拟实验 14
3.1 模型的建立 14
3.2 实验方案及参数设计 14
3.2.1网格划分 14
3.2.2火源 14
3.2.3环境条件设置 15
3.3 火灾场景设计 15
4. 模拟结果分析 16
4.2 不同窗墙比下起火面各楼层测点温度变化曲线 21
4.3 不同窗墙比下非起火面各楼层测点温度变化曲线 23
4.3不同窗墙比下各切面烟气变化图 24
4.4不同窗墙比下各切片一氧化碳浓度变化 27
4.5窗墙比对高层住宅外保温层火灾发展影响综合分析 28
5 结论和展望 30
致谢 31 FDS窗墙比对高层住宅外墙保温层火灾蔓延影响分析:http://www.751com.cn/gongcheng/lunwen_17404.html