细水雾抑制舰船会议室火灾的大涡模拟

Large eddy simulation of fire suppression in ship meeting room with water mist extinguishing system

舰船会议室因固体可燃物多且密集，采取自动和人工灭火措施是抑制火灾蔓延的最好方法。舰船会议室传统上采用的是哈龙或惰性气体灭火系统，因其固有的缺点，细水雾灭火系统成为有效防止火灾蔓延的替代技术。基于固体可燃物热解燃烧和火灾蔓延大涡数值模拟方法，研究了舰船会议室的门在开启状态下，细水雾灭火喷头的不同水滴平均直径对抑制室内火灾蔓延和烟气运动的影响。结果表明，当水滴喷射初始速度为5m/s，喷头由自带的温控传感器启动时，采用水滴平均直径小于500μm的喷头，喷出水雾时会强化会议室内火灾的初期蔓延。综合考虑抑制室内火灾蔓延并防止室内电器设备受到损害，细水雾灭火系统喷头的水滴平均直径选为500～750μm较好。

Solid combustibles in the meeting rooms of ships are numerous and densely packed. If a fire oc?curs, it is preferable for automated fire extinguishers and manual fire fighting methods to be used at thesame time. If the situation demands that firefighters go to the scene, a water mist fire suppression system isnecessary. In this paper, a model based on the pyrolysis kinetics of solid combustibles and the Large EddySimulation (LES) are used to investigate fires in an open-door ship's meeting room with a water mist firesuppression system, and the effects of different diameters of water droplets on the spread of the fire and themotion of the smoke are obtained. The simulated conditions are such that the initial velocity of the dropletsequals 5 m/s, and the water mist fire suppression system is activated by the temperature sensors on thesprayers. When the average diameter of water droplets is less than 500 μm, the fire in the ship's meetingroom is enhanced in the first stages of spraying. In order to meet the needs of both suppressing the fire andprotecting the electric equipment, it is suitable for the average diameter of the water droplets to be between500 μm and 750 μm.