机织物的热传递与强热条件下热防护性能  

Heat transfer and thermal protection properties under strong thermal conditions of woven fabrics

作　　者：杨孟想 刘让同[1,2,3] 李亮 刘淑萍[1,2,3] 李淑静 YANG Mengxiang;LIU Rangtong;LI Liang;LIU Shuping;LI Shujing(Zhongyuan University of Technology,Zhengzhou,Henan 451191,China;Advanced Textile Equipment Technology Provincial and Ministerial Collaborative Innovation Center,Zhengzhou,Henan 451191,China;Zhengzhou Key Laboratory of Flame-Retardant,Heat Insulating and Fire-Resistant Functional Clothing and Materials,Zhengzhou,Henan 451191,China)

机构地区：[1]中原工学院,河南郑州451191 [2]先进纺织装备技术省部共建协同创新中心,河南郑州451191 [3]郑州市阻燃隔热耐火功能性服装与材料重点实验室,河南郑州451191

出　　处：《纺织学报》2023年第11期74-82,共9页Journal of Textile Research

基　　金：国家重点研发计划项目(2017YFB0309100)。

摘　　要：在高低温、热辐射和烈火场等强热物理场,要求服装具有隔热功能。为探究组织结构、热源强度对机织结构材料热防护性能的影响,采用有限元模拟方法,研究热源强度为0.8 kW/m2条件下,6种组织芳纶、涤纶机织结构材料的瞬态热传递过程特征,得到材料的温度云图和表面温度时变图,观察温度时变图,从隔热时间和隔热温度2个维度提出强热条件下评价织物热防护性能的5大指标。结果表明:热流沿纱线浮长传递,形成与浮长相关的上、下表面温度和温差;热流达到下表面的滞后时间越长,下表面的温升速度越慢,形成的温差越大,下表面形成的稳定温度越低,材料的防护效果越好,6种组织的隔热防护性能由低到高排序为:平纹、2上1下斜纹、3上1下斜纹、4上1下斜纹、5上1下斜纹、6上1下斜纹;在常规热源条件下,单层织物能够有效阻止热流滞后约1.5 s,强热条件下,需增加防护厚度或叠加其它材料以提高隔热能力;辐射热防护性能测试表明,实验结果与模拟结果存在很好的一致性。Objective Thermal protective clothing has attracted much attention because of its unique thermal insulation function and wide application prospects.However,it is difficult to describe the transient heat transfer process in the fabric by physical tests,and the preparation process of thermal protective fabric needs to rely on a large number of thermal protective performance tests.Therefore,the transient heat transfer process of different woven fabric is simulated by finite element method.Method The transient heat transfer characteristics of six woven fabrics(plain weave,2/1-6/1 twill)of aramid and polyester were studied by finite element simulation,and the temperature nephogram and surface temperature time varying diagram of the fabrics were obtained.From the two dimensions of heat insulation time and heat insulation temperature,five indicators for evaluating the thermal protection performance of fabrics under strong thermal conditions were proposed,namely,the lag time of temperature rise on the lower surface,temperature rise speed of lower surface,stable temperature of upper and lower surfaces,maximum temperature difference and stable temperature difference.The effects of yarn float and heat source intensity on the thermal protection performance of fabrics were studied.Results The heat flow is transmitted along the yarn float,which causes the temperature of the yarn body on the surface of the fabric to rise,and the temperature of the yarn in the weaving area to rise faster,forming the upper and lower surface temperatures and temperature differences related to the yarn float(Fig.3).The lag time,maximum temperature difference and stable temperature difference of the initial temperature rise of the lower surface of the six aramid and polyester fabrics from low to high all exist:plain,2/1,3/1,4/1,5/1,6/1 twill,showing a positive correlation with the fabric float(Fig.5,Fig.6),while the lower surface temperature rise speed and stable temperature show a negative correlation with the fabric float(Fig.4,Fig.6).Under the co

关 键 词：机织物 各向异性 浮长 热传递性能 热防护 数值模拟 

分 类 号：TS101.8[轻工技术与工程—纺织工程]