【作者】 陆春义；

【导师】 余永刚；

【作者基本信息】 南京理工大学 ， 工程热物理， 2004， 硕士

【摘要】 自1987年蒙特利尔公约签署以来，世界各国广泛开展了寻求哈龙系列灭火剂替代品的研究工作。在众多的替代技术中，细水雾灭火技术越来越受到人们的重视，其特点是：无环境污染、不损耗臭氧、无温室效应、灭火迅速、耗水量低、对失火对象破坏性小以及对人员安全，目前已成为国际火灾科学前沿研究的热点之一。 为了研究细水雾抑制熄灭木材火焰的机理及其灭火效果，设计、搭建了一套细水雾喷射系统实验平台。并在此实验平台上开展了细水雾抑制熄灭单木块和木垛火焰的小尺度模拟实验研究。利用热电偶测温系统、数码摄像机等仪器测量了细水雾作用前后燃烧场与木材温度场的变化特征。结果表明：木材预燃时间、细水雾作用时间、雾通量等参数对灭火过程有显著影响。细水雾抑制熄灭木块火焰的主要机理是燃料表面冷却效应。在实验基础上，从传热学的角度建立了木块内部温度场的简化模型，数值计算结果与实验结果吻合较好。更多还原

【Abstract】 The use of water mist (very fine water sprays) for fire suppression is currently receiving increased attention as a replacement technology for halogen-based chemical agents - such as Halon 1301 (CH3Br) the manufacturing of which has been banned by the Montreal Protocol due to their high ozone depletion potential. Water mist technology has been found more advantages such as not contaminating the environment, not destroy the ozone layer, not bring green house effect, fast extinguish, low water consumption, and be safe to the man and other protected objects, it has been received considerable attentions among international fire science research. This article belongs to the field of the science of fire, and is supported by the science fund of Jiang-Su province. According to the objects and requests of the project, an experimental system of water mist was set up. A series of pilot experiment for observing the interaction of water mist with wood fire was conducted. Thermocouples and digital video were used to measured the characteristic parameters of the burning area and the temperature of the mood. Experiments indicated that the pre-buming time, the interaction time, and the flux of mist significantly affected the course of extinguishment. The main mechanism of extinguishment was the surface cooling effect. A simplified theoretical model for the change of the interior of the wood was developed based on heat transfer theory, and the calculated values were in good agreement with the experimental results.更多还原