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Numerical Simulation of Coupled Pyrolysis and Combustion Reactions with Directly Measured Fire Properties

机译：直接测量火灾性能耦合热解和燃烧反应的数值模拟

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In this study, numerical simulations of coupled solid-phase reactions (pyrolysis) and gas-phase reaction (combustion) were conducted. During a fire, both charring and non-charring materials undergo a pyrolysis as well as a combustion reaction. A three-dimensional computational fluid dynamics (CFD)-based fire model (Fire Dynamics Simulator, FDS version 6.2) was used for simulating the PMMA (non-charring), pine (charring), wool (charring) and cotton (charring) flaming fire experiments conducted with a cone calorimeter at 50 and 30 kW/m2 irradiance. The inputs of chemical kinetics and the heat of reaction were obtained from sample mass change and enthalpy data in TGA and differential scanning calorimetry (DSC) tests and the flammability parameters were obtained from cone calorimeter experiments. An iso-conversional analytical model was used to obtain the kinetic triplet of the above materials. The thermal properties related to heat transfer were also mostly obtained in house. All these directly measured fire properties were inputted to FDS in order to model the coupled pyrolysis–combustion reactions to obtain the heat release rate (HRR) or mass loss. The comparison of the results from the simulations of non-prescribed fires show that experimental HRR or mass loss curve can be reasonably predicted if input parameters are directly measured and appropriately used. Some guidance to the optimization and inverse analysis technique to generate fire properties is provided.
机译：在该研究中，进行了偶联固相反应（热解）和气相反应（燃烧）的数值模拟。在火灾期间，炭化和非炭化材料都经历热解以及燃烧反应。基于三维计算流体动力学（CFD）的消防模型（FIR Dynamics Simulator，FDS Version 6.2）用于模拟PMMA（非炭化），松（炭化），羊毛（Charring）和棉花（Charring）火焰用锥形量热计进行50和30 KW / M2辐照度进行的消防实验。从样品质量变化中获得化学动力学和反应热的输入，并从TGA中的焓数据和差示扫描量热法（DSC）测试，并从锥形量热计实验中获得易燃性参数。使用ISO-即合分析模型来获得上述材料的动力学三重态。与热传递相关的热性质也大多在房屋中获得。所有这些直接测量的火质都被输入到FDS中，以模拟偶联的热解 - 燃烧反应，以获得热释放速率（HRR）或质量损失。来自非规定火灾模拟的结果的比较表明，如果直接测量并适当使用输入参数，则可以合理地预测实验性HRR或质量损失曲线。提供了用于产生防火属性的优化和逆分析技术的一些指导。

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