To investigate the influence of altitude on smoke propagation of train fire accident in tunnels,based on the validated numerical simulation method, the sliding grid technology was used to achieve the entire motion process of a train running at a uniform speed in a tunnel, decelerating after a fire accident and eventually stopping in the tunnel. The three-dimensional unsteady N-S equation and RNG k- ε turbulence model were adopted, and the reliability of the numerical simulation method was verified by the datas of the scaled train fire accident test in tunnel. The results indicate that the altitude has a significant impact on the smoke propagation after fired trains stop in the tunnel. Compared with low altitude tunnels at a time, the smoke propagation velocity at the same location as the tunnel vault is faster in high altitude tunnels, and the time when the smoke countercurrents to 50 m upstream of the fire source is earlier. The temperature distribution around the train also shows a rising trend with the increasing altitudes. Compared with the train fire accident in the tunnel at an altitude of 0 m, the time is 102 seconds earlier when the smoke in the tunnel at an altitude of 5 000 m countercurrents to 50 m upstream of the fire source. At the same time, the peak value of temperature at the tunnel vault is increased by 216 K, with an increase of 42.9% when the fired train stopped for 360 seconds.
MAZ H. Study on the law and control method of smoke spread in high altitude and extra long railway tunnel[D]. Beijing: China Academy of Railway Sciences Corporation Limted, 2020:1-5. (in Chinese)
[3]
SEIKEM, KAWABATAN, HASEGAWAM, et al .The retarding effect of fixed barriers on smoke propagation in tunnel fires[J].Tunnelling and Underground Space Technology,2019,85:100-113.
XUZ S, WANGY L, ZHAOJ M, et al .Influence of fire at different positions in metropolitan rapid rail transit vehicle on temperature field distribution of tunnels[J]. Journal of Railway Science and Engineering,2023,20(9): 3476-3487.(in Chinese)
[6]
WANGH T, GAOH H .Study of blockage effects of metro train on critical velocity in sloping subway tunnel fires with longitudinal ventilation[J].Energies,2022,15(15):5762.
[7]
张子洋. 特长隧道内高速列车移动火灾烟气蔓延规律研究[D]. 成都: 四川师范大学, 2021.
[8]
ZHANGZ Y. Research on smoke spreading regularity of high-speed train moving fire in extra-long tunnel[D]. Chengdu: Sichuan Normal University, 2021. (in Chinese)
[9]
王哲. 坡度对地铁隧道内列车火灾烟气蔓延特性研究[D]. 长沙: 中南大学, 2020.
[10]
WANGZ. Research on the smoke movement characteristics of subway train fire in inclined tunnel[D]. Changsha: Central South University, 2020. (in Chinese)
[11]
ZHOUD, HUT E, WANGZ, et al. Influence of tunnel slope on movement characteristics of thermal smoke in a moving subway train fire[J]. Case Studies in Thermal Engineering, 2021, 28:101472.
[12]
胡天恩. 曲线隧道内地铁列车火灾烟气蔓延特性研究[D]. 长沙: 中南大学, 2022.
[13]
HUT E. Research on smoke movement characteristics of subway train fire in curved tunnel[D]. Changsha: Central South University, 2022. (in Chinese)
ZHOUD, TANGZ T, HUT E, et al. Research on effect of tunnel radius on smoke movement characteristics in subway trains fire[J]. Journal of Railway Science and Engineering, 2023, 20(10):3918-3927.(in Chinese)
[16]
张念. 高海拔特长铁路隧道火灾燃烧特性与安全疏散研究[D]. 北京: 北京交通大学,2012.
[17]
ZHANGN. Research on combustion characteristics and safety evacuation of high-altitude super-long railway tunnel[D].Beijing: Beijing Jiaotong University, 2012.(in Chinese)
ZHANGN, TANZ S .Numerical simulation study on smoke distribution of fire in high-altitude super-long railway tunnels[J].China Safety Science Journal,2013,23(6):52-57.(in Chinese)
ZHANGN, TANZ S, MAOJ. Study on the impact of high-altitude on combustion characteristics of fire[J]. Journal of Taiyuan University of Technology, 2011, 42(5): 545-548.(in Chinese)
WANGM N, GUOX H, NIG B, et al .A discussion on the control standards for smoke CO concentration during fires in high-altitude railway tunnels[J]. Modern Tunnelling Technology, 2022, 59(3): 40-45.(in Chinese)
LIUX L, ZHANGX, LIX F, et al .Laws of smoke diffusion and temperature distribution in super-long high-altitude highway tunnel on fire[J]. Science Technology and Engineering,2022, 22(31): 13958-13964.(in Chinese)
WANGF, ZHANGL H, YUANS, et al. Critical velocity of fire smoke control in high-altitude highway tunnels[J]. China Journal of Highway and Transport, 2022, 35(5): 153-160.(in Chinese)
BAIY, YUANS. Study on smoke flow characteristics of high altitude highway tunnel fire[J]. Modern Tunnelling Technology,2021, 58(Sup.1): 520-527.(in Chinese)
[30]
YUAND, WANGY, ZHANGY, et al. The impact of altitude effect on tunnel fire characteristics[J]. Bulgarian Chemical Communications, 2015, 47: 239-242.
[31]
LIUB, MAOJ, XIY H, et al .Effects of altitude on smoke movement velocity and longitudinal temperature distribution in tunnel fires[J]. Tunnelling and Underground Space Technology,2021,112:103850.
[32]
LIUB, MAOJ, XIY H, et al .Effect of altitude on vertical temperature distribution and longitudinal smoke layer thickness in long tunnel fires[J]. Fire and Materials, 2023, 47(1): 16-27.
WANGZ W, MAW B, HANZ L, et al .Characteristics of fire smoke spread in high altitude railway tunnel rescue station[J].Railway Engineering, 2021, 61(12): 133-137.(in Chinese)
QINN R, DAIZ .Discussion on fire prevention and control measures of EMU equipment cabin[J]. Fire Technique and Products Information,2018,31(5):16-19.(in Chinese)
[37]
铁路隧道设计规范:TB 10003—2016 [S].北京:中国铁道出版社,2017.
[38]
Code for design of railway tunnel:TB 10003—2016 [S]. Beijing:China Railway Publishing House,2017.(in Chinese)
LIUC L .Discussion on the cross section optimization of high-altitude extra-long railway tunnel driven using TBM[J]. Railway Engineering,2020,60(3):28-33.(in Chinese)
[41]
LIUC, ZHONGM H, TIANX L, et al .Experimental and numerical study on fire-induced smoke temperature in connected area of metro tunnel under natural ventilation[J].International Journal of Thermal Sciences,2019,138:84-97.
[42]
WANGZ, ZHOUD, KRAJNOVICS, et al .Moving model test of the smoke movement characteristics of an on-fire subway train running through a tunnel[J].Tunnelling and Underground Space Technology,2020,96:103211.