For the fire smoke control of the interchange ramp connecting the main tunnel at both ends, the effect of the longitudinal induced air velocity, smoke vent size and fire source location on the top centralized smoke exhaust effect was investigated with the help of numerical simulation software FDS based on the Nanjing West Jianning Road Curve A ramp project. The results show that: the fire source is located in the middle of the ramp, the induced air speed is 1.0 m/s to ensure that the smoke does not "spread across the area", and the smoke control effect is better when the induced air speed is 1.5 m/s and the smoke volume is 150 m3/s; the smoke spread range in the ramp decreases with the increase of the smoke vent size, and when the smoke vent length to width ratio is 4 and the area. When the smoke vent aspect ratio is 4 and the area is 6 m2, the smoke control effect in the ramp is better, and the overall smoke exhaust efficiency of the system is more than 98%; when the smoke vent aspect ratio is unchanged, the maximum temperature of the vault decreases with the increase of the smoke vent area; when the smoke vent area is unchanged, the maximum temperature of the vault increases with the increase of the smoke vent aspect ratio. When the fire source is located in the upstream or downstream of the ramp, the smoke exhaust air volume should be increased to at least 210 m3/s and the induced air velocity should be optimized.
Zeng Yanhua
,
Yang Guichang
,
Tao Liangliang
,
Zhao Dongxu
,
Zhang Yimin
. Study on the Effect of Centralized Smoke Exhaust from Underground Interchange Ramps[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(3)
: 997
-1005
.
DOI: 10.20174/j.JUSE.2024.03.29
[1]Kennedy W D. Longitudinal ventilation analysis for the Glenwood canyon tunnels[A]// Proceedings of the Fourth International Symposium Aerodynamics and Ventilation of Vehicle Tunnels[C]. 1982:169-186.
[2]Oka Y, Atkinson G T. Control of smoke flow in tunnel fires[J]. Fire Safety Journal, 1995,25: 305-322.
[3]Wu Y, Bakar M, Jagger S, et al. Control of smoke flow in tunnel fires using longitudinal ventilation system-a study of the critical velocity[J]. Fire Safety Journal, 2000, 35: 363-390.
[4]Tang F, He Q, Mei F, et al. Effect of ceiling centralized mechanical smoke exhaust on the critical velocity that inhibits the reverse flow of thermal plume in a longitudinal ventilated tunnel[J]. Tunnelling and Underground Space Technology, 2018,82: 191-198.
[5]Vauquelin O, Megret O. Smoke extraction experiments in case of fire in a tunnel[J]. Fire Safety Journal,2002,37: 525-533.
[6]Ingason H, Li Y Z. Model scale tunnel fire tests with point extraction ventilation[J]. Journal of Fire Protection Engineering,2011,21( 1):5-36.
[7]李保军,陶亮亮,王浩然,等.单侧集中排烟隧道烟气控制数值研究[J].地下空间与工程学报,2020,16(增2):912-917. (Li Baojun, Tao Liangliang, Wang Haoran, et al. Numerical study on the smoke control of single-side centralized smoke exhaust tunnel[J]. Chinese Journal of Underground Space and Engineering,2020, 16(Supp.2):912-917. (in Chinese))
[8]姜学鹏,王成伟,于年灏.集中排烟隧道排烟口合理间距试验研究[J].现代隧道技术,2016,53(4):123-128. (Jiang Xuepeng, Wang Chengwei, Yu Nianhao. Experimental study on the optimal interval of exhaust outlets in a concentrated smoke extraction system[J]. Modern Tunnelling Technology,2016, 53(4):123-128. (in Chinese))
[9]蔡崇庆,姜学鹏,袁月明.排烟口间距对隧道集中排烟烟气层吸穿影响的模拟[J].安全与环境学报,2014,14(6):95-101. (Cai Chongqing, Jiang Xuepeng, Yuan Yueming. Effect of extraction vent distance on smoke layer plugholing under central extraction system in tunnel[J]. Journal of Safety and Environment, 2014, 14(6):95-101. (in Chinese))
[10]刘琪,姜学鹏,蔡崇庆.隧道集中排烟口间距的多目标决策分析[J].安全与环境学报,2013,13(2):214-218. (Liu Qi, Jiang Xuepeng, Cai Chongqing. Analysis of the multiple objective decision of the optimal interval of the exhaust extraction outlets in a centralized tunnel smoke-extraction system[J]. Journal of Safety and Environment,2013,13(2): 214-218. (in Chinese))
[11]陶亮亮,周小涵,付孝康,等.空气幕顶部排烟系统控烟排烟有效性的研究[J].地下空间与工程学报,2021,17(5):1664-1670.(Tao Liangliang,Zhou Xiaohan,Fu Xiaokang,et al.Study on the effectiveness of smoke control of air curtain-top exhaust system[J].Chinese Journal of Underground Space and Engineering,2021,17(5):1664-1670.(in Chinese))
[12]侯立勋,谢恩,陶浩文,等.Y字型隧道纵向通风排烟临界风速研究[J].消防科学与技术,2020,39(12):1671-1675. (Hou Lixun,Xie En,Tao Haowen,et al. Study on the critical velocity of smoke exhaust in a Y-shaped tunnel fire[J]. Fire Science and Technology,2020, 39(12):1671-1675. (in Chinese))
[13]姜学鹏,何超,郭辉.Y型合流分岔隧道临界风速计算模型[J].安全与环境学报,2019,19(1):210-216. (Jiang Xuepeng,He Chao,Guo Hui. A model for calculating the critical velocity of letter Y shape joined bifurcation tunnel[J]. Journal of Safety and Environment, 2019,19(1):210-216. (in Chinese))
[14]Lu X L, Weng M C, Liu F,et al. Study on smoke temperature profile in bifurcated tunnel fires with various bifurcation angles under natural ventilation[J]. Journal of Wind Engineering & Industrial Aerodynamics,2022,225: 105001.
[15]Chen L F, Zhou S X, Lan Y J,et al. Experimental study on fire characteristics of the bifurcated tunnel under multi-directional ventilation[J]. International Journal of Thermal Sciences,2023,185: 108072.
[16]张泽江,刘微,李平立,等.城市交通隧道火灾蔓延控制[M].成都:西南交通大学出版社,2020. (Zhang Zejiang, Liu Wei, Li Pingli,et al. Urban traffic tunnel fire spread control[M].Chengdu: Southwest Jiaotong University Press, 2020. (in Chinese))
[17]徐志胜,谢宝超,张焱,等.公路隧道通风排烟及人员疏散[M].北京:机械工业出版社,2021. (Xu Zhisheng, Xie Baochao, Zhang Yan,et al. Road tunnel ventilation and smoke extraction and personnel evacuation[M]. Beijing: China Machine Press,2021. (in Chinese))
