|Table of Contents|

Influence of position of jet fan on smoke spread characteristics in tunnel fire(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年1期
Page:
49-61
Research Field:
隧道工程
Publishing date:

Info

Title:
Influence of position of jet fan on smoke spread characteristics in tunnel fire
Author(s):
WANG Ya-qiong;  YANG Shao-peng;  REN Rui;  LI Pei-jun; WANG Ting-chuan;  XIAO Fu-wen
(School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China)
Keywords:
tunnel engineering;  tunnel fire;  numerical simulation;  smoke spread;  flow resistance of fire zone
PACS:
U453.5
DOI:
10.19721/j.cnki.1671-8879.2023.01.006
Abstract:
A 1:1 tunnel numerical model with a length of 800 m considering 20 MW fire was established by using the computational fluid dynamics code ANSYS Fluent, which was used to find out the flow resistance of fire zone at a critical velocity and explore the influence of jet fan local wind field on the smoke spread. Through 5 MW fire numerical calculation and 1:10 physical model test, the rationality of the numerical model was verified by comparing the critical velocity and temperature results. The critical velocity and the flow resistance of the fire zone were determined, and the numerical calculation of the tunnel fire scene under different relative positions of the fire source and jet fan was carried out. The results show that the critical velocity of 5 MW fire in a 300 m tunnel is about 2.0 m/s, the corresponding flow resistance of the fire zone is about 3.0 Pa, and the critical velocity of 20 MW fire in an 800 m tunnel is about 2.8 m/s, and the corresponding flow resistance of the fire zone is about 7.0 Pa. Under the condition of the critical velocity of the 20 MW fire, when the fire source is located within 40 m downstream of the jet fan, the smoke stratification is wholly destroyed, and the downstream area is not conducive to evacuation. And when the fire source is located at 80 and 120 m downstream of the jet fan, respectively, the smoke layer status is generally stratified and highly stratified. And the corresponding dangerous evacuation area is 300 and 100 m downstream of the fire. When the fire is located upstream of the fan, the smoke layer is in good condition before it spreads to the fan position. After it applies to the fan position, it quickly spreads to the lower part with the high-speed jet and fills the tunnel section. The downstream area of the fan is a dangerous evacuation area. Therefore, to ensure the safety of evacuation downstream of the fire source, the jet fans in the range of 80 m upstream of the fire source and the evacuation area downstream should not be turned on, and the jet fan in the range of 80 to 120 m upstream of the fire source should be turned on carefully.9 tabs, 24 figs, 26 refs.

References:

[1] 中华人民共和国交通运输部.2021年交通运输行业发展统计公报[EB/OL].(2022-05-25)[2022-11-09].https://xxgk.mot.gov.cn/2020/jigou/zhghs/202205/t20220524_3656659.html.
Ministry of Transport of the People’s Republic of China.Statistical bulletin on development of transport industry in 2021[EB/OL].(2022-05-25)[2022-11-09].https://xxgk.mot.gov.cn/2020/jigou/zhghs/202205/t20220524_3656659.html.
[2]刘 帅,陈建忠,王芳其.公路隧道纵向通风对火灾烟气分层影响研究[J].地下空间与工程学报,2018,14(5):1419-1423.
LIU Shuai,CHEN Jian-zhong,WANG Fang-qi.Influences study of longitudinal ventilation on smoke stratification in tunnel fires[J].Chinese Journal of Underground Space and Engineering,2018,14(5):1419-1423.
[3]赵尊信,唐 飞,朱元涛.毗邻隧道群火灾烟气污染物窜流特征研究[J].工程热物理学报,2021,42(11):3009-3015.
ZHAO Zun-xin,TANG Fei,ZHU Yuan-tao.Study on the characteristics of smoke crossflow of the tunnel group in tunnel fire[J].Journal of Engineering Thermophysics,2021,42(11):3009-3015.
[4]ZHANG Y,CHEN C,LEI P,et al.A study on buoyancy-driven maximum ceiling gas temperature of T-shaped bifurcated channel-like structure in fire environment[J].International Journal of Thermal Sciences,2022,171:107213.
[5]JIANG L,XIAO M.Effect of tunnel slope on the critical velocity of densimetric plumes and fire plumes in ventilated tunnels[J].Tunnelling and Underground Space Technology,2022,123:104394.
[6]ZENG Z,XIONG K,LU X L,et al.Study on the smoke stratification length under longitudinal ventilation in tunnel fires[J].International Journal of Thermal Sciences,2018,132:285-295.
[7]冯 霄,李炎锋,李俊梅,等.纵向通风地下道路火区风压损失分析及应用[J].北京工业大学学报,2016,42(1):81-86.
FENG Xiao,LI Yan-feng,LI Jun-mei,et al.Analysis and application of pressure loss through fire zone in longitudinal ventilated underground road tunnels[J].Journal of Beijing University of Technology,2016,42(1):81-86.
[8]周 延.纵向通风水平隧道火区阻力特性[J].中国矿业大学学报,2006,39(6):703-707.
ZHOU Yan.Flow resistance characteristics of fire zone in horizontal tunnel with longitudinal ventilation[J].Journal of China University of Mining & Technology,2006,39(6):703-707.
[9]程小虎,曾艳华,何 川,等.隧道火灾中火区阻力的理论研究[J].铁道学报,2007,29(5):133-136.
CHENG Xiao-hu,ZENG Yan-hua,HE Chuan,et al.Study on flow resistance in tunnel fire zone[J].Journal of the China Railway Society,2007,29(5):133-136.
[10]赖金星,周 慧,程 飞,等.公路隧道火灾事故统计分析及防灾减灾对策[J].隧道建设,2017,37(4):409-415.
LAI Jin-xing,ZHOU Hui,CHENG Fei,et al.Statistical analysis of fire accidents in highway tunnels and countermeasures for disaster prevention and reduction[J].Tunnel Construction,2017,37(4):409-415.
[11]KAZEMIPOUR A,AFSHIN H,FARHANIEH B.Numerical-analytical assessment of fire and ventilation interaction in longitudinally ventilated tunnels using jet fans[J].Heat Transfer Engineering,2017,38(5):523-537.
[12]ZHOU T N,WANG X H,HE J J,et al.The effect of forced ventilation by using two movable fans on thermal smoke movement in a tunnel fire[J].Journal of Wind Engineering and Industrial Aerodynamics,2019,184:321-328.
[13]THIEN K H,LEE Y M,KIM J T,et al.Numerical study of the effects of the jet fan speed,heat release rate and aspect ratio on smoke movement in tunnel fires[J].Energies,2020,13(5):1206.
[14]蒋天驰,朱 凯,黄亚东,等.隧道渐扩段火灾纵向排烟关键参数研究[J].地下空间与工程学报,2021,17(增1):469-473.
JIANG Tian-chi,ZHU Kai,HUANG Ya-dong,et al.Key parameters of smoke control under longitudinal ventilation in tunnel’s expanding section[J].Chinese Journal of Underground Space and Engineering,2021,17(S1):469-473.
[15]陈长坤,焦伟冰,雷 鹏,等.分岔隧道火灾火源位置对临界风速影响的数值模拟分析[J].中国安全生产科学技术,2022,18(3):93-99.
CHEN Chang-kun,JIAO Wei-bing,LEI Peng,et al.Numerical simulation analysis on influence of fire source position on critical wind velocity of bifurcated tunnel fire[J].Journal of Safety Science and Technology,2022,18(3):93-99.
[16]KRóL A,KRóL M.Transient analyses and energy balance of air flow in road tunnels[J].Energies,2018,11(7):1759.
[17]CHEN T,LI Y Z,XU Z S,et al.Study of the optimal pitch angle of jet fans in road tunnels based on turbulent jet theory and numerical simulation[J].Building and Environment,2019,165:106390.
[18]KRóL A,KRóL M.Study on numerical modeling of jet fans[J].Tunnelling and Underground Space Technology,2018,73:222-235.
[19]钟 委,端木维可,李华琳,等.纵向风作用下隧道火灾烟气分岔流动试验研究[J].中国铁道科学,2016,37(2):56-63.
ZHONG Wei,DUANMU Wei-ke,LI Hua-lin,et al.Experimental study on smoke bifurcation flow in tunnel fire under longitudinal airflow[J].China Railway Science,2016,37(2):56-63.
[20]WU Y,BAKAR M Z A.Control of smoke flow in tunnel fires using longitudinal ventilation systems-A study of the critical velocity[J].Fire Safety Journal,2000,35(4):363-390.
[21]NEWMAN J S.Experimental evaluation of fire-induced stratification[J].Combustion and Flame,1984,57(1):33-39.
[22]HE Y P,FERNANDO A,LUO M C.Determination of interface height from measured parameter profile in enclosure fire experiment[J].Fire Safety Journal,1998,31(1):19-38.
[23]PIARC.Fire and smoke control in road tunnels ventilation for fire and smoke control[R].Pairs:Permanent International Association of Road Congress(PIARC),1999.
[24]WANG F,WANG M N,CARVEL R,et al.Numerical study on fire smoke movement and control in curved road tunnels[J].Tunnelling and Underground Space Technology,2017,67:1-7.
[25]WANG F,WANG M N.A computational study on effects of fire location on smoke movement in a road tunnel[J].Tunnelling and Underground Space Technology,2016,51:405-413.
[26]聂乔敏.细水雾段抑制隧道火灾烟气蔓延的研究[D].武汉:武汉大学,2017.
NIE Qiao-min.Study on control of fire smoke movement in tunnels by water mist segment[D].Wuhan:Wuhan University,2017.

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Last Update: 2023-01-30