Study on smoke transport characteristics of fire inside rail train with multiple lateral openings

doi:10.16265/j.cnki.issn1003-3033.2024.05.0758

Abstract

Abstract:

In order to study the smoke transport characteristics of rail train with lateral multi-opening and optimize the emergency response strategy for fire rescue, a rail train model was built using PyroSim software based on the engineering entity structure and numerical simulation was conducted. Focusing on the lateral opening as a connecting channel between the inside and outside of the train carriage, the influence of the lateral opening mode on the smoke transport characteristics inside the train was discussed and analyzed. The results show that the lateral opening mode has a significant effect on the smoke transport inside the train, including the smoke spreading speed and the smoke distribution in the stable stage. Compared with the disordered smoke and full coverage in the height direction in the section without opening the lateral opening, the smoke in the section with opening the lateral opening can maintain stable stratification, which is conducive to the safe evacuation and rescue of personnel. The smoke temperature distribution under the train ceiling is more consistent with the double exponential attenuation law, and is affected by the coupling of the opening mode and the fire power. The temperature attenuation rate of the opening section is more significantly affected by the fire power in the asymmetric opening. In addition, although the opening is conducive to the formation of a safe environment inside the train, it is also necessary to consider the impact of the fire smoke spilling into the outer space of the train through the opening to make a comprehensive judgment of emergency response.

Key words: multiple lateral openings, rail train fire, smoke transportation, opening mode, personnel evacuation

CLC Number:

X932爆炸安全与防火、防爆

PENG Min, PAN Xiangxiao, HE Kun, LI Zhonghui, ZHU Guoqing. Study on smoke transport characteristics of fire inside rail train with multiple lateral openings[J]. China Safety Science Journal, 2024, 34(5): 129-138.

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References 18

[1]	周庆瑞. 新版国家标准《地铁设计规范》修订辑要简析[J]. 都市快轨交通, 2015(2):131-134.
	ZHOU Qingrui. Analysis of the revised version of code for design of metro[J]. Urban Rapid Rail Transit, 2015(2): 131-134.
[2]	LI Yingzhen, INGASON H. Overview of research on fire safety in underground road and railway tunnels[J]. Tunnelling and Underground Space Technology, 2018, 81: 568-589.
[3]	翁庙成, 孙祥, 林昊宇, 等. 地铁区间隧道烟气层化现象研究[J]. 安全与环境学报, 2018, 18(3): 930-934.
	WENG Miaocheng, SUN Xiang, LIN Haoyu, et al. On the smoke stratification in an interval metro underground tunnel[J]. Journal of Safety and Environment, 2018, 18(3): 930-934.
[4]	LEI Peng, CHEN Changkun, JIAO Weibing, et al. Experimental study on collaborative longitudinal ventilation of smoke control for branched tunnel fires considering different branch angles[J]. Tunnelling and Underground Space Technology, 2023, 136: DOI: 10.1016/J.TUST.2023.105097.
[5]	XU Zhisheng, ZHOU Dongmei, TAO Haowen, et al. Investigation of critical velocity in curved tunnel under the effects of different fire locations and turning radiuses[J]. Tunnelling and Underground Space Technology, 2022, 126: DOI: 10.1016/J.TUST.2022.104553.
[6]	钟茂华, 刘畅, 史聪灵. 地铁火灾全尺寸实验研究进展综述[J]. 中国安全科学学报, 2019, 29(10):51-63. doi: 10.16265/j.cnki.issn1003-3033.2019.10.009
	ZHONG Maohua, LIU Chang, SHI Congling. Progress of full-scale experimental study on metro fire[J]. China Safety Science Journal, 2019, 29(10): 51-63. doi: 10.16265/j.cnki.issn1003-3033.2019.10.009
[7]	LI Yingzhen, INGASON H, LONNERMARK A. Fire development in different scales of train carriages[J]. Fire Safety Science, 2014, 11: 302-315.
[8]	INGASON H. Model scale railcar fire tests[J]. Fire Safety Journal, 2007, 42(4): 271-282.
[9]	NG Y W, CHOW W K, CHENG C H, et al. Scale modeling study on flame colour in a ventilation-limited train car pool fire[J]. Tunnelling and Underground Space Technology, 2019, 85: 375-391.
[10]	SHI Congling, ZHONG Maohua, CHEN Changkun, et al. Metro train carriage combustion behaviors: full-scale experiment study[J]. Tunnelling and Underground Space Technology, 2020, 104: DOI: 10.1016/j.tust.2020.103544.
[11]	CHEN Junfeng, LONG Zeng, LIU Chang, et al. Investigation of the performance of lateral ventilation in subway station fires[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2022, 228: DOI: 10.1016/j.jweia.2022.105133.
[12]	从伟. 地铁隧道/列车双狭长受限空间火灾烟气蔓延与特征参数演化规律[D]. 合肥: 中国科学技术大学, 2022.
	CONG Wei. Fire smoke movement and evolution of characteristic parameters in the double longnarrow and confined space of subway tunnel/train[D]. Heifei: University of Science and Technology of China, 2022.
[13]	王凯, 胡经纬, 杨涛, 等. 地铁站火灾烟流特性及协同集控系统[J]. 中国安全科学学报, 2022, 32(12): 133-140. doi: 10.16265/j.cnki.issn1003-3033.2022.12.2376
	WANG Kai, HU Jingwei, YANG Tao, et al. Fire smoke characteristics and collaborative control system in subway stations[J]. China Safety Science Journal, 2022, 32(12): 133-140. doi: 10.16265/j.cnki.issn1003-3033.2022.12.2376
[14]	YAO Yongzheng, WANG Rui, XIA Ziyang, et al. Smoke movement and control in longitudinal ventilated tunnel fires with cross-passages[J]. Case Studies in Thermal Engineering, 2023, 45: DOI: 10.1016/j.csite.2023.102945.
[15]	WANG Zhiyong, JI Jie, TAN Tiantian, et al. Numerical study on the critical criterion for predicting the plug-holing under lateral mechanical exhaust in tunnel fires: considering the effect of smoke flow in longitudinal direction[J]. Tunnelling and Underground Space Technology, 2022, 128: DOI: 10.1016/j.tust.2022.104666.
[16]	KASHEF A, YUAN Zhongyuan, LEI Bo. Ceiling temperature distribution and smoke diffusion in tunnel fires with natural ventilation[J]. Fire Safety Journal, 2013, 62: 249-255.
[17]	BAUM H, MCCAFFREY B. Fire induced flow field - theory and experiment[J]. Fire Safety Journal, 1989, 2:129-148.
[18]	GONG Liang, JIANG Lin, LI Shouyu, et al. Theoretical and experimental study on longitudinal smoke temperature distribution in tunnel fires[J]. International Journal of Thermal Sciences, 2016, 102: 319-328.

工况编号	缩尺寸火源功率/kW	全尺寸火源功率/MW	侧开口开启模式	工况简称
1	7.9	2.5	全开启	2.5 MW+全开启
2	7.9	2.5	火源单侧	2.5 MW+火源单侧
3	7.9	2.5	火源双侧	2.5 MW+火源双侧
4	15.8	5	全开启	5 MW+全开启
5	15.8	5	火源单侧	5 MW+火源单侧
6	15.8	5	火源双侧	5 MW+火源双侧
7	23.7	7.5	全开启	7.5 MW+全开启
8	23.7	7.5	火源单侧	7.5 MW+火源单侧
9	23.7	7.5	火源双侧	7.5 MW+火源双侧
10	31.6	10	全开启	10 MW+全开启
11	31.6	10	火源单侧	10 MW+火源单侧
12	31.6	10	火源双侧	10 MW+火源双侧

火源功率/ MW	A₁	t₁	A₂	t₂	R²
2.5	0.81	0.3	0.42	14.8	0.996
5	0.63	0.4	0.5	13.4	0.989
7.5	0.5	0.37	0.62	12.2	0.988
10	0.36	1.02	0.65	12	0.988