Journal
FIRE SAFETY JOURNAL
Volume 109, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.firesaf.2019.102864
Keywords
Window ejecting flame; Compartment fire; Ejecting flame height; Combustion efficiency; Heat release rate
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The fast growth of window ejecting flame height has long been thought to be influenced by the vertical wall via partially blocking air entrainment on the by-wall side. In the present research, experiments were conducted by employing a reduced scale compartment-facade model to examine this view and study the factors leading to the fast flame height growth. The inner size of the compartment was 0.4 m (W) by 0.6 m (L) by 0.4 m (H). A 0.2 m by 0.2 m square propane burner was employed as a fire source. Flame height in cases with and without vertical wall were compared. It was shown that in cases both with and without vertical wall, the flame height underwent a rapid growth with increase of heat release rate (HRR) Q when 1.8 <= Q/Q(c) <= 2.5, where Q(c) is the theoretical maximum HRR inside the compartment and Q/Q(c) is a dimensionless HRR. The rapid growth of flame height was mainly caused by the increase of combustion efficiency rather than the vertical wall. The growth of flame height showed a power-law dependence on Q/Q(c). The power index was 0.8, 2.5, and 0.8 for the ranges 1 <= Q/Q(c) <= 1.8, 1.8 <= Q/Q(c) <= 2.5, and Q/Q(c) >= 2.5 respectively.
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