冷激波灭火系统中激波对灭火效果和周边环境的影响

为了评估冷激波灭火弹爆炸后形成的激波对灭火效果和周边环境的影响，建立了一套纹影实验装置。通过纹影实验，观察了小尺寸下不同灭火介质爆炸抛撒后激波的形成和传播，并推算了冷激波灭火弹爆炸后油盆边缘附近的波后质点速度。观察发现，水基灭火介质爆炸抛撒后没有形成激波；而粉基灭火介质尽管爆炸抛撒后形成激波，但在油盆边缘附近激波强度较弱，波后质点速度小。与介质抛撒引起的可燃气体介质运动相比，激波对加快可燃气体介质运动的影响可以忽略。最后，通过高速摄影实验验证了激波对灭火效果的影响是可以忽略的。因此，冷激波系统中，激波对灭火效果和周边环境的影响是可以忽略的。

Influences of shock wave in cold shock wave extinguishing system on fire extinguishing effect and surrounding environment

A schlieren apparatus was established to experimentally evaluate the influences of the shock wave formed by the explosion of the cold shock wave extinguishing bomb on the extinguishing effect and the surrounding environment. The shock waves formed by the explosion and dispersion of the different extinguishing media and the corresponding propagations were observed based on the above mentioned schlieren apparatus. And the particle velocity behind the shock wave front at the edge of the oil pool after the explosion of the cold shock wave extinguishing bomb was calculated. Observation shows that the water based fire extinguishing medium can not form shock wave; and the powder based fire extinguishing medium can form shock wave, but its strength is weak and the particle velocity is low at the edge of the oil pool. Compared with the movement of the combustible gas induced by the medium dispersion, the movement of the combustible gas induced by the shock wave may be neglected. Finally, the above conclusion was verified by a high speed photographic experiment. So for the cold shock wave fire extinguishing system, the influences of the shock wave on the extinguishing effect and the surrounding environment are neglectable.