Abstract
In this paper, to study the influence of stack effect on fire in the compartment adjacent to a stairwell, a set of experiments were conducted by varying the pool size, top vent state and bottom vent size in a 1/3 scaled 12-layer-stairwell configuration. The phenomenon of methanol flame tilting in the fire room was observed and studied. Results showed that the flame tilt angle increases with an increase of Ri-1. The temperatures of hot gases in the fire room decrease due to the cooling effect of fresh air induced by stack effect. The mass loss rate of methanol fuel is influenced by fresh air flow sucked into fire room due to stack effect. On the basis of the experimental results, we conclude that the velocity of air flow into fire room is proportional to 1/3 power of the heat release rate in the stairwell.
Highlights
Many high rise buildings have been constructed in the world
In this paper, to study the influence of stack effect on fire in the compartment adjacent to the stairwell, a total of 12 experiments were conducted by varying the pool size (10, 15, 20, 25 cm), top vent state and size of door 3 on the ground floor (0.12 or 0.24 m2) in a 1/3 scaled 12-layer-stairwell configuration
The flame tilt angle θ is influenced by the air flow and remarkably enlarged by the stack effect action
Summary
Many high rise buildings have been constructed in the world. The fire safety of these buildings has drawn public attention due to the occurrence of many catastrophic fires (Chow 2005; Guo et al 2009, 2010). It’s a common construction that the door face stair hall or lift lobby in high-rise residential building For this kind of building structure, in case a fire occurs in the room adjacent to stair hall or lift bobby, the fire-induced smoke will spread horizontally along the room and corridor ceilings, and move vertically under the influence of stack effect. It is worthy to research the influence of stack effect on fire in the compartment adjacent to stairwell to improve the safety level of high-rise residential buildings structure
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