文档介绍：摘要
建筑火灾是威胁人们生命和财产安全的最直接、最严重的灾害之一。火灾的破坏性极大,它不仅造成巨大的社会财富损失,还严重地威胁着人的生命安全。本文主要利用计算机模拟软件FDS对一般建筑发生火灾后,机械排烟口的风速大小和排烟口的布置位置、方式对火灾烟气排出效果的影响进行数值模拟。在《建筑设计防火规范》中,对排烟口的布置和排烟口的风速没有做出严格的要求,导致对排烟口设计的随意性较大,工程实际设计在这方面有很大的提升空间,为了得到建筑火灾烟气排出效果的最佳结果,本文将模拟过程分为四组,分别从不同排烟口的排烟风速、不同排烟口的布置位置、不同排烟口的布置方式和改变火源后不同排烟口的布置对排烟效果的影响进行分析。空间模型的长25m、宽20m、高5m,体积为2500m3。模拟结果显示为,排烟口布置在建筑空间内起火物质的正上方时,火灾烟气的排出效果最佳,其次是排烟口在建筑房间一面侧墙的顶部位置,排烟效果稍好。排烟口在房间一面侧墙的中部位置排烟效率最低。排烟口的布置方式应采取单一性布置,数量少、面积大的布置方式排烟效率最高。机械排烟口的排烟风度为8m/s时,机械排烟效果最佳,速度为6m/s时,排烟效果最差。通过对机械排烟口的布置和设计速度大小的研究可以为工程设计中提供很好的指导建议。
关键词:排烟口;机械排烟;排烟口位置;排烟风速:fds
Abstract
Building fire is the one of most serious and direct threaten people life safety and property disaster. The fire caused great destruction, it is not only make great social wealth loss, but also have a serious threat to people's life safety. This paper main puter simulation software to research when general building fired , numerical Simulation on the discharge smoke effect of exhaust velocity and smoke outlet decorate. There have no strict requirements to the mechanical smoke exhaust velocity and layout of smoke position in The national norm of building fire,Which make smoke outlet design arbitrariness,so it have a huge promoten space in engineering design. In order to get the best results of smoke exhaust among aspect of building article will divided simulation process into four groups,it describe from four aspect,the exhaust velocity and position of smoke outlet and the form of smoke outlet and when change source of ignition,different smoke outlet have different result. At longes of 25 meters,as wides of 20 meters,as highes of 5 meters,the volume of 2500 cubic meters. Simulation results show that when smoke outlet put above the fire material of building,the efficiency of discharge smoke is best. when smoke outlet put top on one wall of the building room, the effect of discharge smoke is good. When smoke outlet put on middle of one wall in the building room, the result of discharge sm