Spontaneous ignition of corrugated cardboard under dynamic high radiant flux  

作　　者：Liu Liu Yan Gu Hong Yang Xing Wang Yang Zhou Xiaogan Dai Yong Han Shanggang Wen Ming Li Congmei Lin Changgen Feng Fei Tang Yushi Wen 

机构地区：[1]Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621999,China [2]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China [3]State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,China [4]Institute of Applied Physics and Computational Mathematics,China Academy of Engineering Physics,Beijing 100088,China

出　　处：《Defence Technology（防务技术）》2024年第10期65-77,共13页Defence Technology

基　　金：the Presidential Foundation of CAEP(Grant No.YZJJZQ2023008);the National Natural Science Foundation of China(Grant No.NSFC 12372342)for financial support of this work.

摘　　要：Understanding the response of solid combustibles under high radiant fluxes is critical in predicting the thermal damage from extreme scenarios.Unlike the more moderate radiant fluxes in conventional hydrocarbon fires,extreme events such as strong explosion,concentrated sunlight and directed energy can generate dynamic radiant fluxes at the MW/m^(2) level,creating a unique threat to materials.This study investigates the pyrolysis and spontaneous ignition behaviors of corrugated cardboard by using both experimental and numerical methods,under 10-cm dynamic high radiant fluxes ranging from 0.2 to 1.25 MW/m^(2) for 10 s.The spontaneous ignition process at dynamic high radiant fluxes was recorded and quantified.Two ignition modes were found at the critical radiant flux of 0.4 MW/m^(2),namely hot-gas spontaneous ignition and hot-residue piloted ignition.The latter is not the focus of this paper due to its extremely small probability of occurrence.The research reveals that the increase in flux intensity induces shorter delay times for both pyrolysis and ignition,lower ignition energy density,along with a corresponding rise in the critical mass flux and surface temperature at ignition moment.The simulation results are generally aligned with the experimental findings,despite some divergences may be attributed to model simplifications and parameter assumptions.The work contributes to a deeper insight into material behavior under extreme radiation,with valuable implications for fire safety and hazard assessment.

关 键 词：Extreme radiation Fire safety Corrugated cardboard PYROLYSIS Ignition temperature 

分 类 号：TS764[轻工技术与工程—制浆造纸工程]