Influence of fire source distance and annular corridor depth on the smoke barrier effect of a sunken plaza
For smoke accumulation caused by a fire in a four-sided enclosed annular corridor-type sunken plaza,the effect of different fire source distances and annular corridor depth on the visibility,smoke velocity field,and safety area in the sunken plaza was simulated using FDS simulation software.The results show that increasing the distance of the fire source or the depth of the surrounding corridor promotes the continuous collision of smoke in the area of the corridor and into the opening of the square,failing the sunken square smoke exhaust and smoke insulation function;the average visibility at the safe height in the square decreases sharply with the increase of the distance between the fire source and the edge of the opening of the sunken square,up to 6.34 m under the condition of fixed depth of the circular corridor;the depth of the annular corridor is inversely propor-tional to the visibility inside the opening of the sunken plaza and the percentage of the safety area.The depth of the ring corridor on the north side remains unchanged,the ring corridor on both sides increases from 0 m to 6 m,and the average visibility in the square opening decreases by 81.56%;The depth of the ring corridor on both sides remains unchanged,while the ring corridor on the north side increases from 0 m to 4 m,and the pro-portion of the safe area in the square opening decreases by 82.4%.
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