为研究细水雾对发生在船舶机舱和上甲板等受限空间甲烷掺氢爆燃事故的抑爆机理及作用效果，搭建预混气体燃爆实验平台，通过改变预混气体组分、超细水雾粒径、水雾喷洒λ置和有无障碍物等条件，对抑爆机理进行分析。结果表明：水雾抑爆效果受预混气体燃烧不稳定性、障碍物及水雾喷洒λ置的影响。在火焰发展初期，8 μm水雾表现出最佳的抑制效果，火焰速度峰值降低37%，超压峰值降低36%；45 μm水雾表现出促爆效果，火焰速度峰值提升28%，超压峰值提升14%。在障碍物条件下，改变水雾的喷洒λ置，45 μm水雾在障碍物附近喷洒表现出最佳抑制效果，火焰速度峰值降低20%，爆炸超压峰值降低35%。根据该研究，在船舶消防系统布置中，应充分考虑预混气体燃烧的不稳定性、障碍物情况和水雾喷洒λ置，在火焰发展初期应使用对火焰面结构影响最小的8 μm水雾，在障碍物附近应使用45μm水雾，从而最大限度降低事故后果。

 As an important fire-fighting method for ships, the effect of water mist on the deflagration accident of methane mixed with hydrogen in confined spaces such as the engine room and upper deck of the ship is still unclear, and there is a lack of relevant experimental research and explosion suppression mechanism analysis. In view of this, a premixed gas detonation experimental platform was built in this paper, and the mechanism of explosion suppression was analyzed by changing the premixed gas composition, ultrafine water mist particle size, spraying position of water mist and the presence of obstacles. The results show that the explosion suppression effect of water mist is affected by the instability of premixed gas combustion, obstacles and the spraying position of water mist. In the early stage of flame development, 8μm water mist showed the best suppression effect, the peak flame velocity was reduced by 37%, and the peak overpressure was reduced by 36%. 14%. Under the condition of obstacles, changing the spraying position of water mist, the spraying of 45μm water mist near the obstacle showed the best suppression effect, the peak flame speed was reduced by 20%, and the peak explosion overpressure was reduced by 35%. According to this study, in the arrangement of ship fire protection system, the instability of premixed gas combustion, obstacles and the spraying position of water mist should be fully considered, and 8 μm water mist should be used in the early stage of flame development, which has the least impact on the structure of the flame surface, 45μm water mist should be used near obstacles to minimize accident consequences.