某地下商业街火灾时机械排烟模式研究

Mechanical Smoke Extraction System of Underground Commercial Buildings

地下商业街作为火灾防范的重点区域,有效设置其机械排烟尤为重要。以某地下商业街为例,使用数值模拟的方法对其不同排烟模式下的火灾烟气流动状态和烟气控制效果进行分析,研究了排烟速率、排烟范围以及补风设计对排烟效果的影响。通过对烟气层温度及烟气层沉降度的分析得出:排烟速率过大可能使得排烟效率降低,而非起火区的排烟可能导致烟气扰动,但适当增加补风口的面积能起到较好的排烟效果。

Because underground commercial buildings are the focal points of fire protection,effective mechanical smoke extraction is of vital importance to the fire safety of underground commercial buildings. Therefore,a computer simulation is undertaken to analyze the smoke flow and smoke control effectiveness with various smoke extraction methods. The influence of different smoke extraction velocity,extraction coverage area and air supply on the effectiveness of smoke extraction is studied. Based on the analysis of the temperature and height of smoke layer,this paper concludes that high velocity of smoke extraction will reduce the efficiency of extraction,and smoke extraction in the non-smoking area will disturb the smoke while enlarging the area of air supply can achieve a better result.