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以某典型3层十字交叉换乘地铁车站为研究对象,针对地铁车站内可燃物的状况,设计峰值为2MW的t2-增长稳定火源,根据地铁车站结构、各层公共区防烟分区和通风系统设置,将紧急通风模式分为起火层下层送风机组关闭和开启2种。选用计算流体力学软件FDS5.0,将火源设置在地下2层靠近站台端部处,建立地铁车站三维模型,采用大涡模拟(LargeEddySimulation)方法对起火层机械排烟效果进行模拟。对起火层内流场、温度场和速度场的分析结果表明:开启地下3层送风机组可使补向地下2层的风量和地下2层的压力增加,有效地降低火源所在防烟分区内的烟气层厚度和温度,实现更好的防排烟效果。
Taking a typical 3-storey cross-metropolitan subway station as the research object, aiming at the combustibles in the metro station, a 2-meter-long stable source of ignition with a peak value of 2MW was designed. According to the metro station structure, System settings, the emergency ventilation mode is divided into fire layer lower blower off and open 2 kinds. The computational fluid dynamics software FDS5.0 was used to set the fire source at the basement 2 near the end of the platform. The three-dimensional model of the metro station was established and the smoke exhaust effect was simulated by the method of Large Eddy Simulation. The analysis of the flow field, temperature field and velocity field in the fire layer shows that turning on the 3-layer blower unit underground can increase the air volume in the 2-storey underground and the pressure in the underground 2-layer and effectively reduce the smoke source area where the fire source is located Flue gas layer thickness and temperature, to achieve better smoke exhaust effect.