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首页> 外文期刊>The Journal of the Textile Institute >The effect of moisture and air gap on the thermal protective performance of fabric assemblies used by wildland firefighters
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The effect of moisture and air gap on the thermal protective performance of fabric assemblies used by wildland firefighters

机译：水分和气隙对野外消防员使用的织物组件的热防护性能的影响

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摘要

The thermal protection performance (TPP) provided by fabric assemblies used by wildland firefighters is greatly affected by both the moisture and the air gap trapped in multilayer fabrics. In this paper, the effect of moisture, coupled with air gap on TPP was analyzed under radiant heat exposures of 21 kW/m(2). The air gap sizes from 0 to 5.2 mm were analyzed using an air gap height regulation device; the moisture content of the multilayer fabric combinations around 0-70% were obtained by spraying distilled water to simulate varying amounts of sweat absorption. The results obtained indicate that certain air gaps entrapped in multilayer fabric system have a positive effect on TPP for both dry and wet multilayer fabric combinations. However, obvious trend changes in thermal protection were observed among dry and wet configurations when the air gap was moved to different positions. For the wet configurations, the second-degree burn time increased as the air gap moved further from the heat source, which was contrary to burn time response under dry conditions. These findings suggest that the complicated reciprocal effect of air gap and moisture on thermal protection should be both considered in analyzing the TPP of fabric assemblies.
机译：野外消防员所使用的织物组件提供的热防护性能（TPP）受多层织物中的水分和气隙的影响很大。在本文中，在辐射热暴露为21 kW / m（2）的情况下，分析了水分以及气隙对TPP的影响。使用气隙高度调节装置分析了0到5.2 mm的气隙大小；通过喷洒蒸馏水以模拟不同量的吸汗量，可以得到多层织物组合的水分含量约为0-70％。获得的结果表明，对于干式和湿式多层织物组合，多层织物系统中截留的某些气隙对TPP都有积极影响。但是，当气隙移至不同位置时，在干式和湿式配置中观察到热保护的明显趋势变化。对于湿式配置，二次燃烧时间随着气隙距离热源的移动而增加，这与干燥条件下的燃烧时间响应相反。这些发现表明，在分析织物组件的TPP时，应同时考虑气隙和水分对热防护的复杂相互影响。

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