摘要
为研究人字坡变坡点两侧不同的坡度构成对人字坡隧道内火灾环境的影响,通过数值模拟分析了火源位于人字坡隧道变坡点时,外界无风条件下不同隧道坡度组合和火源功率对烟气蔓延和温度分布的影响。结果表明,小坡度侧隧道坡度为1%时,隧道内的自然诱导气流流速和火灾环境受变坡点两侧的坡度组成影响较大,且诱导气流流速与量纲一的火源热释放速率与高度乘积(Q_(w)^(*)H′^(*))的0.1136次方成正比;当小坡度侧的坡度在3%以上时,隧道内的自然诱导气流流速和火灾环境受变坡点两侧的坡度组成影响较小。提出了人字坡隧道内的最高温升模型,人字坡隧道内的最高温升要远高于水平隧道,火源上方及附近的顶棚结构安全应该予以重视。
To investigate the impact of different slope compositions on the fire environment in the tunnel with herringbone slope,the effects of different tunnel slope combinations and fire heat release rate on smoke spread and temperature distribution under natural ventilation were analyzed by the numerical method.Results show that when the slope of the small-slope side tunnel is 1%,the natural induced airflow speed and fire environment are significantly affected by the slope composition on both sides of the variable slope point,and the induced airflow speed is proportional to(Q_(w)^(*)H′^(*))0.1136.When the slope of the small slope side tunnel is not less than 3%,the impact of the slope composition on both sides of the variable slope point can be negligible.Empirical equation for the maximum temperature rise in the herringbone tunnel is drawn,the maximum temperature rise in this kind of tunnel is much higher than that in the horizontal tunnel,and the safety of the tunnel ceiling above and close to the fire source should be concerned.
作者
李俊梅
鲁慧敏
李炎锋
欧阳力
康偲妍
郭志成
LI Junmei;LU Huimin;LI Yanfeng;OUYANG Li;KANG Siyan;GUO Zhicheng(Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology,Beijing University of Technology,Beijing 100124,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100024,China)
出处
《北京工业大学学报》
北大核心
2025年第3期308-316,共9页
Journal of Beijing University of Technology
基金
北京市自然科学基金资助项目(8222002)。
关键词
人字坡隧道火灾
拱顶最高温度
火灾环境
自然诱导气流
烟气扩散
数值模拟
herringbone tunnel fire
maximum ceiling temperature
fire environment
natural induced airflow
smoke spread
numerical simulation
