传统水喷淋灭火系统很难扑救有障碍物遮挡的火焰。针对障碍物油池火进行了全尺寸细水雾灭火有效性的实验研究，深入了解障碍物存在时细水雾对油池火的抑制熄灭作用，同时研究了障碍物与火焰的相对位置、细水雾的工作压力、雾通量、喷头距火焰垂直距离及水平距离等关键因素对灭火有效性的影响，分析了障碍物存在时细水雾的灭火特性，揭示了实验中某些工况下不能扑灭火焰的原因，为细水雾的实际工程应用提供了科学的参考依据。

In fire environments，the traditional fire extinguishing agents can't effectually put out a fire which is sheltered by barrier. Now, a lot of water mist fire extinguishing researches have been made . This paper mainly studies the validity of water mist fire extinguishing and investigates the controlling and extinguishing effects of water mist fire extinguishing when barrier exists. At the same time, this paper also studies how the key factors, including opening degree between nozzle and barrier,water mist pressure, water mist flux and so on, influence the fire extinguishing validity, analyzes the water mist fire extinguishing characters when barrier exists, gives the reason why the water mist can't put out a fire in some conditions，and provides references for practical engineering application.