标准受限空间内细水雾熄灭煤油火的实验和数值模拟

Experimental and Numerical Study on the Suppression of Kerosene Pool Fire with Water Mist in a Standard Confined Compartment

在3.0m×3.0m×2.8m标准受限空间内,采用煤油模拟池火,火灾功率设定为195kW,进行了一系列细水雾灭火试验。对灭火时间做了详细记录,并实验研究了灭火时间的重现性及其相关因素。采用M-9000燃烧分析仪对细水雾施加前后火灾烟气(如氧气、二氧化碳、一氧化碳、一氧化氮、二氧化氮、二氧化硫)的浓度进行了在线测量。其结果表明:细水雾灭火系统熄灭煤油火的时间均在20s以内,灭火时间重现性保持在91.9%以内;施加细水雾后,氧气浓度降低,一氧化碳浓度升高,燃烧更加不完全。采用FDS模拟了细水雾熄灭煤油火,预测的温度场和灭火时间与实验结果吻合较好。

The objective of this work is to investigate the kerosene pool fire suppression with a water mist fire suppression system. For this purpose, a series of experiments were performed in a standard enclosed compartment of 3.0 m × 3.0 m × 2.8 m with the fire power fixing 195 kW. The fire-extinguished time for each experiment was recorded and the repeatability of the extinguishing time at ‘identical’ conditions was analyzed in the present study. The smoke concentrations such as oxygen, carbon monoxide, nitrogen monoxide, nitrogen dioxide, sulfur dioxide etc, were also respectively measured on-line by the M -9000 combustion analyzer before and after the application of water mist. The results show that the extinguishing time was all below 20 s and the repeatability of extinguishing time kept within 91.9%. After spraying water mist, the burn became more incomplete with the decrease of oxygen concentration and the increase of CO concentration in the compartment. Furthermore, numerical simulations were performed by using Fire Dynamics Simulator （FDS, Vet. 4.0）, it shows that the temperature field and extinguishing time predicted by FDS is in accord with that by experiments.