单、双喷头细水雾对正庚烷池火灾的抑制作用

Inhibition effect of water mist with single and double nozzles on n-heptane pool fire

为了研究单、双喷头细水雾抑灭正庚烷池火灾的效能和机理,在半体积飞机模拟货舱中开展了单、双喷头细水雾雾滴粒径测试和抑灭20 cm正庚烷池火灾的实验研究。结果表明,双喷头细水雾协同工作会导致雾滴之间相互碰撞发生二次破碎,有助于雾化效果的提升。通过对燃料表面温度、火焰区平均温度和舱内氧气浓度的测量和计算,对比分析了单、双喷头细水雾抑灭火的主导机理。结果表明,单喷头细水雾灭火的平均时间为283.14 s,耗水量约为3.54 L,燃料表面冷却是其抑灭火的主导机理。双喷头细水雾灭火的平均时间为212.22 s,耗水量约为5.31 L,火焰冷却是其抑灭火的主导机理。

In order to study the effectiveness and mechanism of single and double nozzle water mist in suppressing n-heptane pool fire,the droplet size of water mist with single and double nozzles and the suppression of a 20 cm n-heptane pool fire were studied in a simulated cargo compartment of a half volume aircraft.The results show that the cooperation of the double nozzles will lead to the collision between the droplets and secondary breakup,which is helpful to improve the atomization effect.Based on the measurement and calculation of fuel surface temperature,the average temperature of flame zone state and oxygen concentration in cabin,the dominant mechanism of water mist suppression with single and double nozzles is analyzed.The results show that the average time of single nozzle water mist fire extinguishing is 283.14 s,and the water consumption is about 3.54 L.The fuel surface cooling is the main mechanism of fire suppression.The average time of double nozzles water mist fire extinguishing is 212.22 s,and the water consumption is about 5.31 L.Flame cooling is the main mechanism of fire suppression.