细水雾抑制火旋风的实验研究

Experimental study on extinguishment of fire whirlwind by water mist

应用热成像方法测取了火旋风,发现了火旋风大高度直径比的特有物理现象;将超细水雾作用于火旋风和油池火,应用三维LDV/APV(laserdopplervelocimeter/adaptivephasevelocimeter)系统对火旋风流场进行了测量,发现在相同的雾通量作用下,火旋风能被熄灭,而油池火却不能被灭掉。通过对细水雾作用于火旋风机理的讨论发现,对不同物理形态的火焰,细水雾灭火的有效性不同,从而为细水雾抑制、熄灭火旋风火灾机理的研究提出了一种有效的实验方法。

Experimental study on the physical phenomenon of the fire whirlwind temperature field by infrared thermography is carried out. The big height to diameter ratio of the fire whirlwind is discovered. The experiment of the water mist acting on the fire whirlwind and the pool fire is done, The flow field of the microwater mist interacting with the fire whirlwind is effectively measured by the LDV/APV system. It is found that the fire whirlwind can be extinguished, but the pool fire of the same size cannot be put out under the same water mist volume flux. The mechanism of the extinguishment of the fire whirlwind by water mist is discussed. The fireextinguishing efficiency of the water mist varies with fires of different physical forms. And an effective experiment measurement is presented for the study of the mechanism in suppression and extinguishment of the fire whirlwind by water mist.