地暖采暖单层大空间中火灾烟气下降规律及控制研究  

On the smoke movement and its control in the large space of the single story buildings via the ground heating

作　　者：李璞[1,2] 李倩文[3] 张旭光[3] 

机构地区：[1]中南大学消防工程系,长沙410000 [2]开封市消防支队,河南开封475000 [3]郑州市消防支队,郑州450000

出　　处：《安全与环境学报》2015年第5期127-134,共8页Journal of Safety and Environment

基　　金：河南省基础与前沿技术研究项目(142300410289)

摘　　要：模拟实际地暖采暖空间建立小规模试验装置,研究了该环境中的烟气下降规律及其危险性。结果表明,地暖采暖环境加速了烟气的发展速度,使危险提前到来。在试验研究的基础上,讨论运用FDS模拟地暖采暖空间烟气运动的可靠性。并利用FDS软件,对真实采暖单层大空间的火灾烟气下降规律进行了数值模拟,提出了该环境中影响烟气运动的主要因素及其控制措施。The present study is aimed to find the smoke movement regularity and its control in the large space of the single story building via the ground heating. It is just for the said purpose that we have done a simulated research and carried out a series of experiments for investigating the smoke descending and its harmfulness consequence while considering the temperature-stratified ambient in the space with the ground heating. The results of our study have shown that the smoke descending is affected by the temperature lapse rate（ the value of γ）. It can also be accelerated in the space via the ground heating,which is likely to lead to the danger ahead of arrival. We have also simulated the smoke movement in the space through the ground heating and compared the experimental and simulated results so as to make sure the reliability of FDS. As a result,we have made clear that the smoke descending can be simulated via the software FDS in such a particular environment. What＇s more,the software FDS can also help us to simulate the smoke descending of the real fire scene of the ground heating in such one-storied large spaces. As a result,we have disclosed the chief influential factors on the smoke movement,which can be illustrated as follows： the heat release rate,the temperature of the ceiling,the temperature of the wall and the temperature distributions. It is such influential factors in the given environment that inhibit the increase of the heat release rate.In addition,it can be deduced that,the lower the temperature of the ceiling and the wall,the faster the smoke descends. And,in turn,the higher the value of the temperature lapse rate,the faster the smoke descends. That is the rudimental cause that is influencing the ground heating. However,such a situation can be improved by adding the assistant heating facilities and improving the performance of the heat-conservation materials. And,then,when we studied the validities of various smoke control systems,we have found that it is of great importance to take into ac

关 键 词：安全工程 烟气运动 烟气控制 地暖采暖 单层大空间 

分 类 号：X913.4[环境科学与工程—安全科学] TU832.1[建筑科学—供热、供燃气、通风及空调工程]