Ignition of mulch and grasses by firebrands in wildland-urban interface fires
Ignition of mulch and grasses by firebrands in wildland-urban interface fires
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DOI：
10.1071/wf06031
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发表时间：
2006-01-01
影响因子：
3.1
通讯作者：
Yang, Jiann C.
中科院分区：
文献类型：
--
作者：
Manzello, Samuel L.;Cleary, Thomas G.;Yang, Jiann C.
在荒地-城市界面（WUI）火灾中，树木和建筑物燃烧时会产生火把或余烬。据信，在WUI火灾中产生的火把阵雨可能会点燃位于房屋和建筑物附近的植被和覆盖物。这反过来又可能导致房屋和建筑物因燃烧植被和覆盖物而着火。了解由于火种引起的点火事件对于减轻社区火灾蔓延非常重要。为了评估这些材料的引燃倾向，模拟的几何形状均匀，但在两个不同的大小，被允许撞击燃料床的碎硬木覆盖物，松秸秆覆盖物，和剪草。这些材料的水分含量是不同的。在火灾模拟器/探测器评估器（FE/DE）装置的测试单元内悬挂并点燃火把。利用FE/DE研究了空气流动对燃料床着火倾向性的影响。点火制度地图生成的每种材料测试作为一个功能的影响燃烧器的大小，沉积的燃烧器，空气流量，和材料的水分含量。
Firebrands or embers are produced as trees and structures burn in wildland-urban interface (WUI) fires. It is believed that firebrand showers created in WUI fires may ignite vegetation and mulch located near homes and structures. This, in turn, may lead to ignition of homes and structures due to burning vegetation and mulch. Understanding the ignition events that are due to firebrands is important to mitigate fire spread in communities. To assess the ignition propensity of such materials, simulated firebrands of uniform geometry, but in two different sizes, were allowed to impinge on fuel beds of shredded hardwood mulch, pine straw mulch, and cut grass. The moisture content of these materials was varied. Firebrands were suspended and ignited within the test cell of the Fire Emulator/Detector Evaluator (FE/DE) apparatus. The FE/DE was used to investigate the influence of an air flow on the ignition propensity of a fuel bed. Ignition regime maps were generated for each material tested as a function of impacting firebrand size, number of deposited firebrands, air flow, and material moisture content.