Numerical Study on Suppression of Post-flashover Compartment Fire by Using Water Mist

The fire suppression effectiveness of water mist for different development stages of fire is obviously different. In order to study the suppression effectiveness of water mist on the post-flashover compartment fire, the interaction process of water mist and post-flashover fire was simulated by using FDS, the effect of water mist characteristics on fire suppression was analyzed, and the suppression mechanism of water mist for the post-flashover fire was proposed. The results show that the post-flashover compartment fire can be effectively suppressed when the minimum spray intensity of high pressure water mist system specified in GB 50898 standard increases to 2.22 L/min.m2; The suppression effectiveness of medium pressure water mist on post-flashover compartment fire is inferior to that of high pressure water mist; cooling effect on the flame and oxygen displacement are the primary suppression mechanisms of water mist for post-flashover compartment fire.