空气层厚度对热防护面料蒸汽防护性能的影响

为探索防护服装与人体皮肤之间的空气层厚度对其蒸汽防护性能的具体影响,选用3种不同热防护面料系统,设计4种不同的空气层厚度(0、6、12、18 mm),分析二级烧伤时间、三级烧伤时间、吸收总热量和热流量,评价面料系统的蒸汽防护性能。研究结果表明:不同的面料系统提供不同的防护性能,增加面料系统的厚度有利于提升其防护性能,防水透气膜越靠近蒸汽热源,系统的防护性能越好;防护服装的蒸汽防护性能与空气层厚度有着显著相关性,在空气层厚度增加到12 mm及以上时,防护服的蒸汽防护性能会得到显著提升;通过分析蒸汽暴露和冷却阶段传感器热流量变化曲线,可进一步分析了解蒸汽暴露环境下织物系统内的热湿传递机制。

Influence of air gap size on steam protective performance of fireproof fabric

In order to investigate the influence of air gap between fabric layers and human skin on protective performance of protective clothing against steam, three different fabric systems were selected and four levels of air gap, i.e., 0 mm, 6 mm, 12 mm, and 18 mm, were designed. Time to 2^nd and 3^rd burn degree, total absorbed energy and heat flux were recorded and analyzed to evaluate the impact of air gap on the protective performance. The results show that thermal protection is different for different fabric assemblies. If the fabric thickness is bigger and moisture barrier is arranged more close to the steam hazard, the fabric system provides higher thermal protection. Further, a significant relationship exists between the thermal protection against steam and air gap size. If the air gap size is higher than 12 mm, thermal protective performance against steam exhibits a significant increase. The analysis of heat flux curve during exposure and cooling phase can facilitate the further understanding of the heat and moisture transfer mechanism.