文档介绍：集热罩对喷头启动时间影响的数值模拟
摘要
近年来,随着经济社会的快速发展,大空间建筑(如体育馆、展览馆、音乐厅等)越来越多地出现在城市中间,由于空间大、跨度大的特点使得这类大空间场所在发生火灾时,其内部的自动喷水灭火系统的启动会受到一定的影响,并且由于许多大空间场所属于人员密集的公共场所,绝大多数观众对场地疏散路线不熟悉,更不了解建筑布局及周围环境。在发生火灾情况下,人员容易惊慌,拥堵疏散通道及出口,如果在消防设计和管理方面出现问题,必然会造成大量人员伤亡对人民的生命财产安全构成了很大的威胁。集热罩作为能够聚集烟气和热量,从而使喷头快速响应的一种组件,被广泛的用于许多大空间的场所,然而在《自动喷水灭火系统设计规范》GB50084-2001中并没有对他的用材、尺寸、形状进行规范,使在工程中设置集热罩无章可循。本文通过分析大空间场所的的特点,并选择美国NIST发行的FDS软件作为研究工具分别对集热罩在边长为200mm、400mm、600mm、800mm;边缘厚度为40mm、50mm、60mm;喷头距火源的垂直高度为6m、7m、8m、9m;,通过对比分析集热罩对大空间场所中喷头的作用效果,为集热罩的设计提供一定的工程指导。
关键词: 喷头; 启动时间; 集热罩; FDS
Numerical Simulation on Activation Time of Sprinkler Head with Different Heat Gather Cover
Abstract
In recent years,with the rapid economic and social development,the large spatial constructions(such as the gymnasium, exhibition halls, concert halls and so on.)appear in more and more of characteristics with large space as well as large span of such places, the internal sprinkler system will be activated with a certain impact when in fire many spatial constructions are the public places where have intensive staff .the vast majority of viewers are not familiar with evacuation routes venues, and also do not understand the position and the surrounding. In fire situation, personnel easy startled and congested evacuation routes and exports, if there are any problems in the design and management, this may cause a large number of casualties on the security of people's lives as well as pose a great threat on people’s properties. Because as one kind of module, the gathering heat covers can gather the haze and the heat, so that causes the sprinkler has fast response. Thus, it is widely used in many large spaces, but in the “Automatic Deluge system Design Standard” GB50084-2001 did not regulate its material, size, shape, so that there is not have a specific regulation to follow during the project of setting gathering heat covers .In this paper, I choose large-eddy simulat