Abstract: In order to explore the technical feasibility of extinguishing flowing fire by water mist under the condition of lateral injection, a theoretical model of extinguishing flowing fire by water mist in open space was established on the basis of considering the radiation transmission of the flame and the convective heat transfer between the fuel and the cushion. The effects of the number of water mist nozzles and the inclination angle on the flame shape, flame temperature, fire extinguishing mechanism and fire extinguishing time were studied experimentally. The results showed that the fire extinguishing ability can be enhanced when the water mist impinging fuel accelerates its flow. Horizontal spraying with single row nozzle can effectively suppress one side flame and has the strongest flame stretching effect. The two-row nozzle horizontal spraying can effectively suppress the flames on both sides and the fire extinguishing speed is the fastest. When the nozzle tilted upward by 15°, the ability of water mist to cool the fuel weakened and the extinguishing time prolonged.

Key words: fire protection, water mist fine extinguishing system , flowing fire , nozzle setting