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Numerical study on the ceiling gas temperature in a subway train with different fire locations

Building Simulation 2022年第4期15卷 549-560页

作者： Wei Cong Long Shi Zhicheng Shi Min Peng Hui Yang Xudong Cheng State Key Laboratory of fire Science University of Science and Technology of ChinaHefeiAnhui 230026China Civil and Infrastructure Engineering School of EngineeringRMIT UniversityMelbourne 3004Australia

Ceiling gas temperature rise is an important evaluation indicator determining the level of risk in a subway tunnel ***,very little literature has been found that has addressed the emergency when a fired subway train with lateral multiple openings stops in the interval ***,a battery of full-scale numerical simulations were employed to address the impact of train fire location on the gas temperature beneath the train *** results showed that the ceiling gas temperature rise is affected by the pressure difference on both sides of fire source and the backflow from the end wall,which depends on the heat release rate and the fire *** ceiling gas temperature rise decays exponentially in the process of longitudinal spread,and it can be predicted by a dimensionless model with a sum of two exponential ***,based on a critical fire location(L'cr=0.667),two exponential equations were developed to quantitatively express the influences of the fire size and the fire location on the maximum ceiling gas *** research results can be utilized for providing an initial understanding of the smoke propagation in a subway train fire.

关键词： train fire subway tunnel fire location temperature attenuation maximum gas temperature numerical simulation

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Battery train fire Risk on a Steel Warehouse Structure

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Journal of Architectural Environment & Structural Engineering Research 2021年第3期4卷 9-19页

作者： Jasmine Mira Nicole Braxtan Shen-En Chen Tiefu Zhao Lynn Harris Dave Cook Department of Civil and Environmental Engineering University of North Carolina at CharlotteCharlotteNC 28223USA Department of Electrical and Computer Engineering University of North Carolina at CharlotteCharlotteNC 28223USA Deutsche Bahn Engineering RaleighNC 27601USA Rail Propulsion Systems FullertonCA 92831USA

Lithium ion battery fire hazard has been well-documented in a variety of ***,battery train technology has been introduced as a clean energy concept for *** the case of heavy locomotives such as trains,the massive collection of battery stacks required to meet energy demands may pose a significant *** objective of this paper is to review the risk evaluation processes for train fires and investigate the propagation of lithium ion battery fire to a neighboring steel warehouse structure at a rail repair shop through a case *** methodology of the analyses conducted include a Monte Carlo-based dynamic modeling of fire propagation potentials,an expert-based fire impact analysis,and a finite element(FE)nonlinear fire analysis on the structural *** case study is presented as a demonstration of a holistic fire risk analysis for the lithium ion battery fire and results indicate that significant battery fire mitigations strategies should be considered.

关键词： Lithium ion battery train fire Propagation Structural safety

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3D Simulation of Battery fire on a Large Steel Frame Structure due to Depleted Battery Piles

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Journal of Architectural Environment & Structural Engineering Research 2022年第3期5卷 34-51页

作者： Nicole Braxtan Jorge Nunez Shen-En Chen Tiefu Zhao Lynn Harris Dave Cook Department of Civil and Environmental Engineering University of North Carolina at CharlotteCharlotteNC 28223US Department of Electrical and Computer Engineering University of North Carolina at CharlotteCharlotteNC 28223US Deutsche Bahn RaleighNCUS Rail Propulsion Systems FullertonCAUS

Lithium ion batteries(LIB)can rupture and result in thermal runaway and battery *** the process of transporting lithium ion batteries using trains,the massive collection of batteries can cause train fire and pose significant danger to the *** is especially critical when the fire occurs amid a heavily populated metropolitan *** paper reports the 3D analysis of a warehouse with possible train fire due to LIB rupture and the fire propagation at a rail *** critical fire cases with the battery train in close vicinity to the warehouse were *** six fire cases are the worst-case scenarios of a Monte Carlo simulation of different fire cases that may occur to an actual steel storage facility at the Capital Railyard,Raleigh,North Carolina.A 3D finite element(FE)frame model was constructed for the steel warehouse and the most critical fire cases were *** results indicated that several structural components of the warehouse would experience large stresses and deflections during the simulated battery fires and resulting in instability to the ***,members of the roof frame represent the most critical elements and that the members can result in large deformations as early as 4 minutes after the fire ***,effective utilization of fire protection can delay somewhat the fire effects and extend time to failure to 45 minutes and in one of the simulated cases,prevent structural ***,fire from LIB waste transport using train is a very realistic problem due to the thermal runaway,and the analysis performed in current study can be used as a preventive investigation technique for buildings that may be exposed to the train fire risk.

关键词： Lithium ion battery train fire Propagation Structural safety

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