排烟量和送风比对地下街烟气控制的模拟研究

以淮南市某地下商业街其中一防火分区为研究对象,采用模拟软件FDS进行了火灾烟气控制的数值模拟,对顶棚机械排烟条件下,排烟量和送风比对室内火灾烟气有效控制的影响进行了研究,模拟分析结果表明,在顶棚机械排烟时,排烟量对室内烟气控制的影响较大。当排烟量为115m3/（m2·h）时,可以达到很好的烟气控制效果,送风比对此的影响较小;当排烟量和送风比过大时,使室内烟气紊流加剧,火场情况混乱。研究结果为此类狭长型地下建筑火灾的控制和人员疏散提供参考。

Numerical Simulation of Smoke Control in an Underground Street with Regulation of Extraction Volume and Mechanical Ventilation- extraction Ratio

The software FDS was applied to the simulation of the fire smoke control in an underground shopping street in Huainan. The present study explores the effects of extraction volume and mechanical ventilation - ex- traction ratio on the effectiveness of smoke control. For the mechanical exhaust vents at ceiling, the simulation results indicate that extraction volume and mechanical ventilation - extraction ratio had some effect on smoke control. It will be reached a good effect of smoke controlling when smoke exhaust rate are suitable. But the in- door smoke turbulence will be intensified and the fire - ground situation will be in chaos when smoke exhaust rate and air supply proportion are too big. It can be make a good effect of smoke controlling when smoke exhaust rate is 115 m3（ m2 . h）. The research results make some references for fire control and personnel evacuation with long and narrow type underground building