细水雾扑灭B类火的全尺度实验

根据IMO有关测试规范的要求，进行了一系列全尺度动力机舱模拟灭火实验。实验中采用的是局部保护细水雾灭火系统，通过改变通风条件、预燃时间、喷雾方式及火焰功率等因素，考察了它们对系统灭火有效性的影响。实验结果表明，细水雾系统可有效扑灭动力机舱内设定的各种工况下的油池火和油雾火，与气体灭火系统相比，受通风条件影响小，能有效降低室内温度及CO、CO2浓度，因而系统工作期间消防人员和操作人员可安全进入。在油池火灭火实验中发现通过火焰冷却灭火时所需时间较短，而依靠燃料表面冷却灭火时则时间较长。此外研究结果还显示，采用侧喷方式时，系统的灭火性能将大大提高，而较长的预燃时间则有利于细水雾扑灭油雾火。

Full-scale tests of class B fire suppression by water mist

A series of full-scale fire suppression tests were conducted according to the testing protocol of IMO. In these tests the local application water mist fire suppression systems were used, and the parameters such as ventilation conditions, preburn time, orientation of spray ejection and heat release rate of fires were changed to examine their influence on the effectiveness of water mist fire suppression. The results of the tests show that water mist fire protection systems can extinguish designed pool fires and spray fires effectively, and under ventilation conditions can perform superior to gas agent fire suppression systems. The discharge of the water mist also can cool the compartment effectively, reduce the concentration of CO and CO2. In pool fire suppression tests it was observed that the fire extinguishment by flame cooling took a very short time, while extinguishment by surface cooling took a longer time. And it is also found that side ejection can enhance the performance of water mist fire protection systems. For spray fire suppression it is found that longer preburn time shortens extinguishing time.