摘要
通过建立穿着于模拟人体的应急救援防护织物传热模型,研究模拟火灾环境下的服装传热特征。模拟人体肢体的圆柱体内核保持恒定温度37℃,模型考虑了织物吸收热辐射及热属性随温度变化的特性,运用有限差分完全隐式格式方法模拟计算织物与人体皮肤的一维径向温度分布,将计算得到的温度值代入Henriques烧伤模型方程以预测皮肤达到二级烧伤所需的时间,其值与实验结果较为一致。研究结果表明,圆柱几何形状对天然阻燃高聚物纤维织物的热防护性能影响效果较为显著,所建立的模型为覆盖于圆柱体的多孔材料传热提供了系统的研究方法。
In order to study the characteristics of heat transfer within the clothing exposed to fire, the paper develops a numerical model of heat transfer in emergency rescue protective fabrics sheathing a cylinder simulating a human limb. The column inside the cylinder system simulating the human body is assumed to keep at a constant temperature of 37 ℃. This model has taken into consideration the protective clothing absorbing the radiant heat and the change of its properties resulting from it. Temperature distribution along the radial between the clothing and skin was calculated with the help of a finite difference, complete implicit scheme. Henriques＇ skin burn equation is quoted to predict the time needed leading to a second-degree thermal burn based on the calculated temperature value. The results coincide with experimental values. The numerical model shows that the cylindrical geometry has a significant effect on the thermal protective performance of the intrinsical heat-flame resistant fabric of polymer nature. At the same time, the method also helps to establish a systematic way for analyzing heat transfer in other cylindrical applications.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2009年第4期106-110,共5页
Journal of Textile Research
关键词
应急防护服
传热模型
火灾
热防护性能
emergency protective clothing
heat transfer model
fire
thermal protective performance
