不同喷射策略下高压细水雾灭火试验研究

试验研究高压细水雾扑灭汽油池火的工作机理,对比了连续水雾喷射和脉冲水雾喷射抑制汽油池火的工作特性。搭建受限空间试验室,通过PWM(脉冲宽度调制)控制电磁阀来改变水雾喷射策略实现连续水雾喷射和脉冲水雾喷射。细水雾扑灭汽油池火的主要作用机理是窒息缺氧和表面冷却降温。试验结果表明:在开门状态的受限空间内,脉冲水雾喷射比连续水雾喷射能更有效扑灭汽油池火;相比连续水雾喷射,脉冲水雾喷射表现出先慢后快的灭火过程;脉冲水雾喷射较连续水雾喷射的降温速率高;脉冲水雾喷射能更有效抑制火场内一氧化碳生成。

Experimental Research on Fire Extinguishing by High Pressure Water Mist with Different Injection Strategies

Experiments were conducted to study the mechanism of extinguishing gasoline pool fire with high pressure water mist,and the functioning characteristics of continue injection and pulse injection towards suppressing gasoline pool fire were compared. A confined space laboratory was set up,the water mist injection strategy was able to be changed through PWM( Pulse Width Modulation) control and to be switched between continue injection and pulse injection. The core mechanism for water mist to put out gasoline pool fire lies in indoor hypoxia and surface temperature cooling. Test results have shown that pulse injection can extinguish gasoline pool fire more effectively than continue injection under confined space open door status;compared to continue injection,pulse one demonstrates a slow start and a later faster speed throughout the process;pulse injection has higher cooling rate than continue one;pulse injection can inhibit the formation of CO in the fire scene more effectively.