Ignition of Mulch Beds Exposed to Continuous Wind-Driven Firebrand Showers
Ignition of Mulch Beds Exposed to Continuous Wind-Driven Firebrand Showers
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DOI：
10.1007/s10694-014-0425-2
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发表时间：
2015-07-01
期刊：
影响因子：
3.4
通讯作者：
Hayashi, Yoshihiko
中科院分区：
文献类型：
--
作者：
Suzuki, Sayaka;Manzello, Samuel L.;Hayashi, Yoshihiko
进行了一系列实验来检查覆盖床对连续的风驱动火阵雨的点燃。切碎的硬木覆盖物安装在 1.2 m x 1.2 m、厚度为 51 mm 的床上，连接到不可燃的凹角组件上。然后，覆盖物/凹角组件受到由安装在日本建筑研究所火灾研究风洞设施中的 NIST 全尺寸连续馈送火源发生器产生的连续风驱动火源轰击。这些实验确定了安装在真实建筑结构中的覆盖床在风驱动的火阵雨下的点火行为。通过改变覆盖床的风速和湿度（MC）进行实验。据观察，连续使用小型风驱动火把（其尺寸与加利福尼亚州和德克萨斯州实际荒地-城市界面火灾中观察到的火把尺寸相似）导致在风速为 8 m/s 时，MC 下的覆盖物床起火高达 83%。火种的积累是引发火灾的关键因素。
A series of experiments were conducted to examine ignition of mulch beds to continuous, wind-driven firebrand showers. Shredded hardwood mulch, fitted in beds 1.2 m by 1.2 m with a thickness of 51 mm, was attached to a non-combustible reentrant corner assembly. The mulch/reentrant corner assembly was then exposed to continuous, wind-driven firebrand bombardment generated by the NIST full-scale Continuous Feed Firebrand Generator installed in the Fire Research Wind Tunnel Facility at the Building Research Institute in Japan. These experiments have determined ignition behavior of mulch beds installed in realistic building configurations under wind-driven firebrand showers. Experiments were performed by varying the wind speed and moisture content (MC) of the mulch beds. It was observed that continuous application of small wind-driven firebrands, with sizes similar to those observed in actual wildland-urban interface fires in California and Texas, resulted in flaming ignition of mulch beds held at MC up to 83% under wind speeds of 8 m/s. The accumulation of firebrands was a key factor to produce ignition.