Identifying the number of firebrands generated during wildfires is an important aspect of understanding their propagation. A key challenge in quantifying the number of firebrands released is to distinguish those that are ‘hot’ and could lead to further fire spread from the total number released. Recently, a fire-resistant fabric was used to quantify the number of ‘hot’ firebrands released from different species of trees (based on char marks). However, information regarding the temperatures of the firebrands leaving the char marks was not reported. In this paper, we demonstrate a methodology for characterising the charring behaviour of fire-resistant fabrics and illustrate how the fabric can be used for firebrand generation studies. The results established a minimum temperature (300°C) for char mark formation. The sensitivities of charring to temperature and time of contact between the fabric and heater are reported. A first-order analysis estimated the char mark area to be an exponential function of the temperature, power input and time of exposure. Illustrating the usefulness of the approach, the fire-resistant fabric was deployed to study hot firebrand production rates for trees treated with and without a fire retardant. The number of hot firebrands produced was lower for trees coated with fire retardant.

中文翻译：

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使用耐火织物量化热火柴的生产

确定野火期间产生的火把数量是了解其传播的一个重要方面。量化释放的火种数量的一个关键挑战是从释放的总数中区分那些“热的”并可能导致进一步火势蔓延的火种。最近，一种耐火织物被用来量化从不同种类的树木释放的“热”火标的数量（基于炭标记）。然而，没有报告关于留下炭痕的火种温度的信息。在本文中，我们展示了一种表征耐火织物炭化行为的方法，并说明了该织物如何用于火点生成研究。结果确定了形成炭痕的最低温度 (300°C)。报告了炭化对温度和织物与加热器之间接触时间的敏感性。一阶分析估计字符标记面积是温度、功率输入和暴露时间的指数函数。为了说明该方法的有用性，使用阻燃织物来研究用和不用阻燃剂处理的树木的热火烧产生率。对于涂有阻燃剂的树木，产生的热火柴的数量较少。使用防火织物来研究使用和不使用阻燃剂处理的树木的热燃烧产生率。对于涂有阻燃剂的树木，产生的热火柴的数量较少。使用防火织物来研究使用和不使用阻燃剂处理的树木的热燃烧产生率。对于涂有阻燃剂的树木，产生的热火柴的数量较少。