Abstract Fire interactions between multiple 1 m tall, 0.7 m diameter chamise shrubs was studied utilizing the Wildland-Urban Interface Fire Dynamics Simulator (WFDS, Mell et al., 2009). Two shrub arrangements were investigated. First, nine shrubs were placed in a 3 × 3 horizontal region. The shrub separation distance and wind speed were varied. Two competing interaction mechanisms were identified: heat feedback enhancement, primarily due to thermal radiative heating, and air entrainment restriction. Shrub burning characteristics were examined and a global average burning rate was analyzed. For the no wind condition, the peak mass loss rate of the center shrub is 23% higher than the others, indicating that heat feedback enhancement is dominant. Air entrainment causes the surrounding shrubs to burn less intensely. At an imposed wind speed, air entrainment effects are dominant. Shrubs that are best shielded from the wind burn most intensely. Second, the vertical separation between two shrubs was varied under different wind conditions. With no ambient wind, nearly no interaction between the two shrubs was observed. At a wind speed of 1 m/s, significant interaction between shrubs occurred due to flame-tilting. The downwind shrubs burned the most vigorously for vertical separation distances between 0.2 and 0.8 m.

中文翻译：

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水平和垂直分隔的多个燃烧灌木中的火灾行为

摘要 使用 Wildland-Urban Interface Fire Dynamics Simulator (WFDS, Mell et al., 2009) 研究了多个 1 m 高、0.7 m 直径的吊椅灌木之间的火灾相互作用。研究了两种灌木排列。首先，九个灌木被放置在一个 3 × 3 的水平区域。灌木的分离距离和风速是变化的。确定了两种相互竞争的相互作用机制：热反馈增强，主要是由于热辐射加热和空气夹带限制。检查了灌木燃烧特性并分析了全球平均燃烧率。在无风条件下，中心灌木的峰值质量损失率比其他灌木高23%，表明热反馈增强占主导地位。空气夹带导致周围灌木的燃烧不那么强烈。在施加的风速下，加气效应占主导地位。最能挡风的灌木燃烧得最强烈。其次，两种灌木之间的垂直间隔在不同的风条件下是不同的。在没有环境风的情况下，几乎没有观察到两种灌木之间的相互作用。在 1 m/s 的风速下，由于火焰倾斜，灌木之间发生了显着的相互作用。对于 0.2 到 0.8 m 的垂直间隔距离，顺风灌木燃烧最剧烈。