Experimental study on the pulse water mist fire suppression system performance in a confined space

Water mist system is used widely in confined spaces, where fire protection and suppression efficiency is very important due to limited water and no water damage. Pulsed water mist is a new type of fire extinguishing system that sprays and pauses in cycle during the procedure of fire extinguishment. Focusing on the fire suppression performance of pause water mist system, a series of experiments have been conducted to explore a more effective pause cycle way, fire suppression behavior, and the temperature distribution in a confined space. The results can be found that the best fire extinguishing effect was achieved with a pulse cycle alternating between an 8-s activation and an 8-s deactivation. With the increase in size of the vents, the advantage of the pulse water mist system gradually diminishes. The smothering method is better than the cooling method. The results of the study may provide a reliable reference for the practical application of pulsed water mist system.