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flame spread over Aviation Kerosene with an Obstacle in Liquid Phase

Journal of Thermal Science 2011年第6期20卷 543-547页

作者： Jin GUO Shouxiang LU Manhou LI Changjian WANG State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230026 China School of Chemical Engineering Anhui University of Science and Technology Huainan 232001 Anhui China

The phenomena of flame spread over aviation kerosene with an obstacle in liquid phase are investigated experimentally through surface temperature measurement by using infrared camera,schlieren images of subsurface flow in front of and behind obstacle and residence time of flame obtained from video *** results reveal that obstacle has no effect on gas phase controlled flame *** for liquid phase controlled flame spread,flame can be stopped by an obstacle with its top edge flush with oil surface,and the residence time decreases with the increase of initial temperature of *** conduction and radiation only play a subsidiary role in flame spread over liquid fuel was proved by schlieren images and surface temperature profiles.

关键词： flame spread temperature profile infrared subsurface flow obstacle

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Numerical Simulation of Microgravity flame spread Over Solid Combustibles

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Journal of Thermal Science 1995年第2期4卷 141-149页

作者： JIANGXi FANWeicheng StateKeyLaboratoryofFireScience UniversityofScienceandTechnologyofChinaHefeiAnhui230026China State

A computational model of three-dimensional, time-dependent flame spread in microgravity environment is presented. The solid is assumed to be a thermally-thin, pyrolysing cellulosic sheet. The gas phase model includes the full Navier-Stokes equations with density and pressure variations and six-flus model of radiation heat transfer. The solid phase model consists of continuity and energy eqllations whose solution provides boundary conditions for the gas phase equations. In the numerical procedure, the gas-and solid-phase equations are solved sepaxately and iteratively at each time step. Predictions have been made of flame spread in slow forced flow under gravitational acceleration normal to fuel surface and flame spread in a quiescent environment in an enclosed chamber under gravitational acceleration parallel to fuel surface. Numerical simulations show that, under microgravity, slow-flow conditions, flame spread process is highly unsteady with the upstream flame spreads faster than the downstream flame after a period of ignition. It has also been shown that the level of microgravity has a significant effect on the name spread process.

关键词： microgravity combustion flame spread numerical simulation.

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

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Building Simulation 2022年第4期15卷 495-510页

作者： Jiayidaer Baolati Kaiyuan Li Yanyan Zou Kevin Frank George Hare Jiaqing Zhang Fanliang Ge School of Safety Science and Emergency Management Wuhan University of TechnologyLuoshi Road 122Wuhan 430070China BRANZ Private Bog 50908Porirua 5240New Zealand Electric Power Research Institute State Grid Anhui Electric Power Co.LTDHefei 230601China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230027China

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 *** paper proposes a new model for large-scale fire spread on medium density fibreboard(MDF)*** 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 *** predicted heat flux and distance of lateral flame spread are consistent with the experiments and an existing *** effects of kinetic properties and heat of combustion are identified through a sensitivity *** 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 *** low activation energy(71.9 kJ/mol)and high heat of combustion(46.5 MJ/kg)of the model ensure the occurrence of flame ***,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 ***,when the burner is extinguished,the modelled in-compartment gas temperature is lower than the experimental values,resulting in a lower heat flux *** 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

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