This article presents a large eddy simulation and experimental study of cedar façade behavior exposed to a 900 kW window spilled flame. The experiments used for validation were carried out in the Building Research of Institute of Japan in Tsukuba according to JIS A 1310 method. The compartment fire was modeled by using the modified eddy dissipation model with a diffusion mixing time scale for the near wall laminar region of combustion model, oneEqEddy model of turbulence model, pyrolysis chemistry mode of pyrolysis model, and finite volume discrete ordinates method of radiation model. The fire flame is treated as optically thin, and a fixed radiant fraction 0.35 is used to calculate the radiation source term. The pyrolysis model of cedar was modeled and optimized according to the results of fire propagation apparatus test. The influence of cedar parameters on time-to-pHRR (peak HRR), pHRR, and (total heat release rate) THR curves of facade fire were clarified by a series of simulation varying from thermal density, conductivity, heat capacity, and pyrolysis reaction parameters. It indicates the simulation results show a reasonable good quantitative agreement with experimental measurements. The activation energy of cedar pyrolysis shows a great influence on the time-to-pHRR, low pHRR, and THR of cedar facade.

中文翻译：

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雪松立面火灾数值及试验研究

本文介绍了雪松立面暴露于 900 kW 窗户溢出火焰时的大涡模拟和实验研究。用于验证的实验是在日本筑波研究所建筑研究所根据 JIS A 1310 方法进行的。采用改进的涡流耗散模型和扩散混合时间尺度的近壁层流区域燃烧模型、湍流模型oneEqEddy模型、热解模型的热解化学模型和辐射模型的有限体积离散纵坐标法对隔间火灾进行建模。 . 火焰被视为光学薄，并且使用固定的辐射分数 0.35 来计算辐射源项。根据火蔓延装置试验结果对雪松热解模型进行建模和优化。通过一系列从热密度、电导率、热容量和热解反应变化的模拟，阐明了雪松参数对立面火灾的 pHRR 时间（峰值 HRR）、pHRR 和（总热释放率）THR 曲线的影响参数。这表明模拟结果与实验测量结果具有合理的良好定量一致性。雪松热解的活化能对雪松外墙的pHRR、低pHRR和THR有很大影响。