Abstract The effects of freestream flow on fire spread behaviors of a discrete wooden fuel array were studied. The spacing between fuel elements was varied, and the flame spread behavior under 1, 2, and 3 m/s forced flow velocities was investigated. The fastest spread rate was not observed for the smallest spacing. Furthermore, increasing spacing did not necessarily lead to a slower spread, as seen with the flame spread along the 0.75 cm spaced array which was as fast or faster than the 0.5 cm spacing condition. At a spacing of 1 cm, fragmented flames were observed at wind speeds of 3 m/s that coincided with a slower spread rate than the 2 m/s wind conditions. The anomalies were explained using flame visualization and pitot probe measurements to determine the effects of flow speed at different spacing conditions. It seems that a coupling between the combustion and fluid dynamics of flow around the dowel cylinders under certain conditions strongly affects the fire spread behaviors.

中文翻译：

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强制对流火沿木销阵列蔓延

摘要 研究了自由流对离散木质燃料阵列火灾蔓延行为的影响。改变燃料元件之间的间距，并研究了在 1、2 和 3 m/s 强制流速下的火焰蔓延行为。对于最小间距，没有观察到最快的铺展速度。此外，增加间距不一定会导致更慢的蔓延，正如沿着 0.75 厘米间隔阵列的火焰蔓延所见，与 0.5 厘米间隔条件一样快或更快。在 1 cm 的间距处，在 3 m/s 的风速下观察到碎片火焰，这与比 2 m/s 风速条件下的蔓延速度更慢。使用火焰可视化和皮托管测量来解释异常，以确定不同间距​​条件下流速的影响。