Much work has been done to investigate and better understand flashovers. However, these flashover theories generally do not apply to long and narrow confined spaces such as tunnels or other corridors. There are differences in the fire growth process between long-narrow spaces and typical enclosures. For instance, in long, narrow spaces, the combustion products are forced in the axial directions resulting in very fast smoke movement. It is important to understand this and other phenomena of fire behavior in tunnels. This paper discusses the results of reduced-scale experiments to better determine the fire growth characteristics and critical conditions for flashover for long-narrow spaces.
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