Abstract: In this paper, the suppression of gas explosion by water mist was experimented in a closed vessel of 68 mm in diameter and 1 200 mm in length, and the effects of different amount of water mist on the maximum gas explosion pressure and the maximum pressure increase rate were analyzed. The results show that the maximum gas explosion pressure and maximum pressure increase rate increase, and the time of explosion pressure reaching the peak value decreases, at the situation of a small amount of water mist. With the increase of the amount of water mist, the maximum explosion pressure and maximum pressure increase rate decrease, and then the time of explosion pressure achieving at the peak value increases. This shows that a large amount of water mist may have more obvious influence on gas explosion.

Key words: water mist, gas explosion, amount of water mist, maximum explosion pressure, maximum pressure increase rate