A large exterior LED video cladding wall consists of pixel modules made of polymeric materials and may pose significant fire hazards to its built environment due to high combustibility. In order to accurately evaluate the fire hazards brought by this technology, it is essential to understand the realistic flame propagation characteristics, such as the vertical and lateral flame propagation rates over the exterior surface of video cladding walls. In this study, a performance-based engineering approach using a computational fluid dynamics (CFD) modeling tool as well as small-scale standard test data was adopted to analyze and determine the flame propagation characteristics over an exterior video cladding wall in a real-world fire scenario. A vertical flame propagation pattern found through simulations is presented in the paper. It is also discovered that when compared with critical radiative heat flux, the ignition temperature plays a more dominant role on the flame propagation over the surface of video cladding wall. Furthermore, numerical accuracy of the simulations is discussed in this paper.

中文翻译：

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基于性能的工程方法，可准确确定外部视频覆层墙上的火焰传播特性

大型外部 LED 视频覆层墙由聚合物材料制成的像素模块组成，由于其高度可燃性，可能对其建筑环境造成重大火灾危险。为了准确评估该技术带来的火灾危害，了解真实的火焰传播特性至关重要，例如视频覆层外表面的垂直和横向火焰传播速率。在这项研究中，采用基于性能的工程方法，使用计算流体动力学 (CFD) 建模工具以及小规模标准测试数据来分析和确定真实世界中外部视频覆层墙上的火焰传播特性火灾场景。论文中介绍了通过模拟发现的垂直火焰传播模式。还发现，与临界辐射热通量相比，着火温度对视频覆层墙表面的火焰传播起着更重要的作用。此外，本文还讨论了模拟的数值精度。