Abstract: Aiming at the fire of tobacco raw materials in the tobacco warehouse, a full - scale experiment was carried out to study the fire extinguishing effect of high - pressure water mist. It is found that when water mist acts on the bottom or side fire source, the fire extinguishing effect is obvious. For the fire between the crevices of the cartons, the fire extinguishing effect is poor; by setting different nozzle heights, it is found that the higher the nozzle height is, the lower the droplets momentum to the fire source is, and the fire extinguishing effect is greatly reduced; at the same time, it is found that the fire in the tobacco warehouse is prone to smoldering, once a large amount of fresh air enters the confined space, it is very easy to reignite.

Key words: high pressure water mist, tobacco warehouse fire, sprinkler height, fire source location