侧向排烟系统排烟口机械排烟数值分析

发布时间：2018-02-21 20:41

本文关键词： 公路隧道侧向排烟口机械排烟吸穿 N百分法排烟效率　出处：《消防科学与技术》2017年03期 　论文类型：期刊论文

【摘要】：针对侧向排烟系统在隧道中的应用,采用FDS数值模拟,根据N百分法计算分界面温度,研究隧道发生火灾时排烟口吸穿现象。通过分析排烟口处的温度、hDEP和CO质量分数变化研究侧向排烟口的排烟效率。研究表明:适当增大排烟风速可以加快烟气排出隧道,同时降低隧道顶棚处温度,但是排烟风速过大会造成吸穿现象,导致排烟效率低。为保证排烟效率,应控制烟气层覆盖至少一半排烟口,单个排烟口的排烟风速宜取4.5~6.0m/s。
[Abstract]:Aiming at the application of lateral exhaust system in tunnel, FDS numerical simulation is used to calculate the interface temperature according to N percent method. In this paper, the phenomenon of smoke exhaust entrainment in tunnel fire is studied. By analyzing the variation of temperature hDEP and CO mass fraction at outlet, the efficiency of side exhaust is studied. The results show that proper increase of exhaust velocity can speed up the exhaust tunnel. At the same time, the temperature at the top of the tunnel was reduced, but the exhaust wind speed was too high and the smoke exhaust efficiency was low. In order to ensure the smoke exhaust efficiency, the flue gas layer should be controlled to cover at least half of the outlet, and the wind speed of the single exhaust outlet should be 4.5 ~ 6.0 m / s.
【作者单位】：南京工业大学安全科学与工程学院;南京工业大学火灾与消防工程研究所;南京工业大学江苏省城市与工业安全重点实验室;
【基金】：国家自然科学基金资助项目(51476075) 江苏高校优势学科建设工程资助项目江苏省普通高校研究生科研创新计划项目(KYLX16_0620)
【分类号】：U453.5

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