为研究4种屏蔽门开启模式下地下岛式站台火灾时排烟效果，本文采用大涡模拟进行计算，研究的开启模式包括开启两侧共4个端门、开启两侧首尾活动门及中间活动门和开启一侧所有活动门、开启两侧所有活动门。着重研究站台危险高度和楼扶梯口处烟气温度、CO浓度、可见度以及顶棚烟气温度。研究发现火灾发展阶段开启两侧屏蔽门首尾及中间活动门的排烟效果最好，火灾稳定阶段开启一侧所有活动门排烟效率较高，开启两侧所有活动门虽然能够加大烟气流出开口，但是排烟效果最差。%The large eddy simulation was applied for calculation to investigate the smoke exhaust effect during fire in under-ground island-type platform under four different switch modes of platform screen doors, which include opening four end doors at both sides, opening the head and tail trapdoors at both sides and middle trapdoors, opening all the trapdoors at one side, and opening all the trapdoors at both sides. The smoke temperature, CO concentration and visibility at dangerous height of platform and stair head were studied with emphasis, as well as the smoke temperature at ceiling. The results showed that in fire development stage, the smoke exhaust effect was the best when opening the head and tail trapdoors at both sides and mid-dle trapdoors, while in fire stable stage, the smoke exhaust efficiency was the highest when opening all the trapdoors at one side. When opening all the trapdoors at both sides, although the smoke flow openings can be enlarged, the smoke exhaust effect was the worst.
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