摘要
结合某大型隧道防排烟工程实际,采用FDS构建集中排烟隧道模型,通过对不同火灾工况下隧道内顶隔板处和2m高处温度、烟气蔓延、排烟道及排烟阀处烟气流速等的定量分析,获得了单向和双向集中排烟模式对排烟效果的影响规律。结果表明:30 MW和50 MW火源功率时,双向排烟顶隔板下方最高温度比单向排烟分别高出200℃和450℃,两种情况下行车道2m高处温度分布相差不大;双向排烟模式下的烟气蔓延范围比单向排烟大;单向排烟下排烟阀处烟气流速按照离排烟风机由近至远递减,且靠近风机的排烟阀流速大于10m/s。
Combing with fire smoke control engineering practice of a large tunnel, tunnel model with the central exhaust system was built by FDS. The smoke extraction effect index such as temperature of top partition and at a distance of 2 m above the ground along the tunnel, smoke spreading distance and the smoke flow rate of exhaust flue and exhaust valves was analyzed quantitatively. And then, the influence laws of the smoke ex- traction effect of bi-directional smoke exhaust mode and uni-di- rectional smoke exhaust mode were obtained. The resultsshowed that： Take 30 MW and 50 MW tunnel fire for exam ples, maximum temperature of top partition under bi-directional smoke exhaust mode are 200 ~C and 450 （2 higher than uni-di- rectional smoke exhaust mode respectively, and temperature at a distance of 2 m above the ground along the tunnel is similar under the two smoke exhaust modes. At the same time, smoke spreading distance under bi-directional smoke exhaust mode is larger than uni-directional smoke exhaust mode. Moreover, the smoke flow rate of exhaust valves was one-way decreasing trend in accordance with away from the exhaust fan from near to far, and the flow rate of the exhaust valve close to the fan is greater than 10 m/s.
出处
《消防科学与技术》
CAS
北大核心
2013年第4期379-382,共4页
Fire Science and Technology
关键词
集中排烟
单向排烟
双向排烟
排烟效果
central smoke extraction
bi-directional smoke ex-haust
uni-directional smoke exhaust~ performance of extraction
