Large eddy simulation of suppression of turbulent line fires by base-injected water mist

作者：Vilfayeau S; Myers T; Marshall A W; Trouve A^*

来源：Proceedings of the Combustion Institute, 2017, 36(2): 3287-3295.

DOI：10.1016/j.proci.2016.06.058

• Flame extinction
• Fire suppression
• Water mist
• Turbulent buoyant diffusion flame
• Large eddy simulation

The objective of this study is to bring basic information on the mechanisms that control flame cooling effectiveness in water mist fire suppression systems. The study is based on well-resolved large eddy simulations (LES) of buoyancy-driven, turbulent, methane-air diffusion flames exposed to water mist injected through a controlled air co-flow. Simulations are performed using an LES solver called FireFOAM and using a modified version recently enhanced with a new flame extinction model based on the concepts of a critical flame Damkohler number for extinction and a critical gas temperature for re-ignition. The numerical simulations provide global information on the flame response to changes in the water mist load as well as spatially-resolved information on the structure of the flame-based heat release rate processes and mist-based evaporation processes. The results suggest that maximum suppression is obtained when mist droplets are entrained into the flame base region.

• 出版日期2017