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以沈阳地下铁路工程为例.利用计算流体力学的SIMPLE算法,在5种防排烟方式下,对地铁站台煤油火灾烟气的蔓延情况进行数值模拟.选取距地铁站台地面2m平面上,两楼梯口中心点作为测点,得到了不同防排烟情况下测点温度及CO_2摩尔分数的实时曲线,及地铁火场温度和CO_2浓度场云图,分析不同的防排烟方式对地铁站台煤油火灾烟气蔓延情况的影响.模拟结果表明,当仅使用机械排烟时,排烟口位置不同,排烟效果相差不大.加压送风系统与机械排烟同时使用,能有效遏制烟气蔓延,并出现周期性衰减的情况;远离火源的楼梯口可作为更加安全的疏散通道.
Taking the Shenyang subway project as an example, the SIMPLE algorithm of computational fluid dynamics (CFD) was used to simulate the spread of smoke on subway station kerosene under 5 kinds of smoke control and smoke suppression methods.From the 2m plane of subway platform, two stairs The real-time curves of temperature and CO 2 mole fraction under different smoke and smoke suppression conditions, as well as the cloud field of the subway fire temperature and the CO 2 concentration field were obtained. Based on the analysis of different smoke and smoke prevention methods, Simulation results show that when using only mechanical exhaust smoke, smoke exhaust port location is different, smoke effect is not much difference.Pressure ventilation system and mechanical exhaust simultaneously, can effectively curb the spread of smoke, and Periodic decay occurs; stairways away from sources of fire can be used as safer evacuation routes.