Large eddy simulation of room fire spread using a medium scale compartment made of medium density fibreboard (MDF) panels  

作　　者：Jiayidaer Baolati Kaiyuan Li Yanyan Zou Kevin Frank George Hare Jiaqing Zhang Fanliang Ge 

机构地区：[1]School of Safety Science and Emergency Management,Wuhan University of Technology,Luoshi Road 122,Wuhan 430070,China [2]BRANZ,Private Bog 50908,Porirua 5240,New Zealand [3]Electric Power Research Institute,State Grid Anhui Electric Power Co.LTD,Hefei 230601,China [4]State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230027,China

出　　处：《Building Simulation》2022年第4期495-510,共16页建筑模拟（英文）

基　　金：This work was supported by the National Key Research&Development(R&D)Plan of China under(No.2020YFC 1522800);the National Natural Science Foundation of China(NSFC)(No.51876148);the Science and Technology Project of State Grid Anhui Electric Corporation of China(No.52120518001S).

摘　　要：At present,there is a shortage of experimental and simulation studies on fire spread in medium-and large-scale compartments while the existing models of the fire spread are limited for typical engineering applications.This paper proposes a new model for large-scale fire spread on medium density fibreboard(MDF)panels.Validating the model with single burning item(SBI)experiments,it is found that the numerical simulation closely predicts the experimental heat release rate(HRR)with some error near the peak.The predicted heat flux and distance of lateral flame spread are consistent with the experiments and an existing model.The effects of kinetic properties and heat of combustion are identified through a sensitivity analysis.The decrease of activation energy and increase of pre-exponential factor make the MDF easier to pyrolyze and the increase of heat of combustion enhances the flame temperature and thus provide more heat feedback to the sample surface.The low activation energy(71.9 kJ/mol)and high heat of combustion(46.5 MJ/kg)of the model ensure the occurrence of flame spread.Furthermore,the model was validated using medium-scale compartment fire experiments and the results showed that the model can accurately predict the HRR after flashover(the error is within 7%).While the burner is ignited,the predictions of in-compartment gas temperature and heat flux are more accurate.However,when the burner is extinguished,the modelled in-compartment gas temperature is lower than the experimental values,resulting in a lower heat flux prediction.The model leads to easier flame spread;therefore,the modelled flame spreads faster in the compartment compared to the experiment,and thus the HRR increases more rapidly.

关 键 词：flame spread compartment fire SBI numerical simulation MDF activation energy 

分 类 号：TU54[建筑科学—建筑技术科学]