Flame spread and burning rates through vertical arrays of wooden dowels
Flame spread and burning rates through vertical arrays of wooden dowels
复制标题
DOI：
10.1016/j.proci.2018.09.008
复制
发表时间：
2019-01-01
影响因子：
3.4
通讯作者：
Gollner, Michael J.
中科院分区：
文献类型：
--
作者：
Jiang, Lin;Zhao, Zhao;Gollner, Michael J.
真实火灾场景中的燃料负荷通常具有离散元素、不连续性或不均匀性;然而，大多数火焰蔓延模型仅假设连续、均匀的燃料。由于离散燃料代表了一个现实的情况下，还没有很好地模拟，它是有趣的，找到简单的方法来模拟火灾增长首先在简单的，实验室规模的配置。因此，进行了详细的实验和理论研究，以调查通过阵列的木销钉，销钉间距为0.75，0.875，和1.5厘米的火焰传播的控制机制。发现对于所有间距，火焰都垂直传播：然而，对于1.5 cm间距，差距太大，不可能发生水平火焰传播。开发了水平火焰传播的辐射控制模型，该模型预测了通过各种销钉阵列的水平火焰传播速率。结合现有的基于对流的垂直火焰传播模型，对水平和垂直火焰传播进行建模，以预测燃烧木钉的数量随时间的变化。利用木钉的燃烧速率模型和边界层理论，开发了一个全球燃烧速率模型，提供了合理的协议与实验结果。(C)2018 The Combustion Institute由Elsevier Inc.出版All rights reserved.
Fuel loads in real-world fire scenarios often feature discrete elements, discontinuities, or inhomogeneities; however, most models for flame spread only assume a continuous, homogeneous fuel. Because discrete fuels represent a realistic scenario not yet well-modeled, it is of interest to find simple methods to model fire growth first in simple, laboratory-scale configurations. A detailed experimental and theoretical study was therefore performed to investigate the controlling mechanisms of flame spread through arrays of wooden dowels, with dowel spacings of 0.75, 0.875, and 1.5 cm. Flames were found to spread vertically for all spacings: however, for the 1.5 cm spacing, the gap was too large for horizontal flame spread to occur. A radiation-controlled model for horizontal flame spread was developed that predicted the horizontal flame spread rate through various arrays of dowels. Combined with an existing convection-based model for vertical flame spread, both horizontal and vertical flame spread was modeled to predict the number of burning wooden dowels as a function of time. Using models for the burning rate of wooden dowels and boundary-layer theory, a global burning rate model was developed that provided reasonable agreement with experimental results. (C) 2018 The Combustion Institute Published by Elsevier Inc. All rights reserved.