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运用FDS软件对某半横向通风隧道火灾进行数值模拟,研究了火灾中火源与排烟口布置中烟气蔓延与排烟效果的影响。通过模拟6种不同火源与排烟口布置组合工况下隧道内烟气质量浓度、回流长度的变化规律,得出半横向通风排烟系统排烟效果规律。结果表明:火源位于隧道中间与右车道时,隧道内烟气质量浓度分布基本相同,表明火源位置横向分布对半横向通风系统排烟效果几乎没有影响,而排烟口分布对火灾烟气的蔓延影响较大,排烟口位于烟道板两侧时隧道内烟气质量浓度和回流长度都明显小于当其位于烟道板中部与右侧1/3处时,表明排烟口位于烟道板两侧时隧道排烟系统排烟效果较好,而排烟口位于烟道板中部与右侧1/3处时,两者排烟效果相同,这与文献的小尺寸试验研究结果相吻合。
FDS software was used to simulate the fire in a semi-horizontal ventilation tunnel and the effect of fire source on the smoke spreading and smoke evacuation was studied. The rule of smoke evacuation in semi-transverse ventilation and exhaust system was obtained by simulating the variation law of the mass concentration of flue gas and the length of reflux in the tunnel with six different fire sources and exhaust openings. The results show that when the fire source is located in the middle of the tunnel and the right lane, the distribution of flue gas mass concentration in the tunnel is basically the same, which shows that the lateral distribution of fire source has little effect on the exhaust effect of the semi-horizontal ventilation system, , The flue gas mass concentration and the reflux length in the tunnel when the exhaust port is located on both sides of the flue plate are obviously smaller than when they are located in the middle and the right 1/3 of the flue plate, The tunnel exhaust system smoke exhaust better when both sides of the road plate, and the exhaust port is located in the middle of the flue plate and the right 1/3, the two smoke the same effect, which is consistent with the results of small-scale studies Anastomosis.