Abstract
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-façade 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/Qc≤2.5, where Qc is the theoretical maximum HRR inside the compartment and Q/Qc 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/Qc. The power index was 0.8, 2.5, and 0.8 for the ranges 1≤Q/Qc≤1.8, 1.8≤Q/Qc≤2.5, and Q/Qc≥2.5 respectively.
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