A new experimental setup was developed to study turbulent, buoyancy-driven flame spread on a corner wall. Two 146 × 50 × 0.58 cm panels of cast black poly(methyl methacrylate) (PMMA), whose pyrolysis properties were fully characterized in a separate study, were ignited using a triangular propane burner. The corner wall assembly was placed into a well-ventilated enclosure and heat release rate (HRR) and flame heat flux to the corner wall were measured in 7 repeated experiments. The HRR measurement was designed to achieve a fast response time (13 s) and was correlated with the flame heat flux, which was obtained using water-cooled heat flux gauges positioned in 28 locations distributed over the PMMA surface. Simultaneously, a monochromatic, 900 nm, video of the spreading flame was recorded and analyzed to determine the evolution of soot radiation intensity and flame geometry. Using collected data, an empirical model relating spatially resolved heat feedback from the flame to the solid fuel surface and HRR was developed and integrated with a detailed pyrolysis model. Simulations were conducted in an uncoupled and coupled mode. The uncoupled simulations, where the flame heat feedback was effectively prescribed to match the experimental measurements, revealed the importance of the knowledge of the split between the convective and radiative portions of the flame heat flux. The coupled simulations, where the flame heat feedback was computed from the simulated HRR, revealed that the coupling amplifies even relatively small uncertainties in the model parameters to produce large errors in the HRR predictions.

开发了一种新的实验装置，以研究湍流，浮力驱动的火焰在角墙上的扩散。使用三角丙烷燃烧器点燃两块146×50×0.58 cm的黑色聚甲基丙烯酸甲酯（PMMA）面板，其热解性能在另一项研究中已得到充分表征。将角墙组件放置在通风良好的外壳中，并在7个重复的实验中测量了放热率（HRR）和到达角墙的火焰热通量。HRR测量旨在实现快速响应时间（13 s），并与火焰热通量相关联，火焰热通量是通过使用水冷热通量计（位于PMMA表面上的28个位置）获得的。同时，单色900 nm 记录并分析了火焰传播的视频，以确定烟灰辐射强度和火焰几何形状的演变。利用收集到的数据，建立了一个从火焰到固体燃料表面和HRR的空间解析热反馈相关的经验模型，并将其与详细的热解模型集成在一起。模拟以非耦合和耦合模式进行。有效地规定了火焰热反馈以匹配实验测量结果的非耦合模拟显示了了解火焰热通量的对流和辐射部分之间分离的重要性。耦合模拟，其中火焰热反馈是根据模拟的HRR计算得出的，