泄漏条件下室内火灾烟气的自然充填过程  

Natural Smoke Filling in Enclosure with Leakage

作　　者：易亮[1] 李勇[1] 

机构地区：[1]中南大学防灾科学与安全技术研究所,长沙410075

出　　处：《燃烧科学与技术》2009年第2期124-128,共5页Journal of Combustion Science and Technology

摘　　要：采用全尺寸实验的方法研究有泄漏条件下室内火灾烟气的自然充填过程.测量了室内外压差和温度分布,在对泄漏分布做一定假设的前提下,估算实验场所的泄漏面积及泄漏流量.对于实验中庭,其侧墙泄漏平均宽度约为0.038 m,顶棚泄漏面积约为0.65 m2.由于泄漏面积较小,烟气充填过程中的泄漏流量远小于烟气羽流质量流量.泄漏的存在对烟气浓度、温度和沉降过程影响不大,但将在室内形成上正下负的内外压差分布及中性面.A full-scale experiment was performed in this paper to study natural smoke filling in enclosure with leakage. Distributions of pressure difference and temperature in an atrium were measured indoors and outdoors. Leaking area and flow rate were estimated with leak distribution in the atrium simplified. For the test atrium, the average width of leak in wails was about 0.038 m and the area of ceiling leak was 0.65 m2. Mass flow rate of leak was much smaller than plume because of small leaking area. Leaking flow has little effect on smoke temperature, concentration and process of filling, but it has significant effect on pressure distribution in fire enclosure. Positive pressure difference in the upper region and negative in the lower region will occur in fire enclosure due to leakage.

关 键 词：室内火灾 泄漏 自然充填 压差 温度分布 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]