气凝胶消防救援服内衬的热阻计算

为提高消防救援服在高温环境中的穿着热舒适性能,探究消防救援服内衬热阻的理论公式推导和数值计算,推导得出粒径、导热系数、填充角度和热阻之间的关系,用Matlab作出三维模型图,表示热阻和三者之间的关系。结果表明:当粒径越小,填充角度越小和导热系数越小时,热阻值越大;当填充颗粒的粒径一定时,等热阻线呈现抛物线趋势,且随着填充角度的增加,总热阻R先减小后增大;当填充角度一定时,等热阻线近似为一条单调递减的斜直线,并且随着粒径与导热系数的增加,总热阻R呈线性减小;当导热系数一定时,等热阻线近似为一条左双曲线,当填充角度为0.92左右时,等热阻线所取的粒径值最大。

Thermal resistance calculation of aerogel fire-fighting clothing lining

In order to improve thermal comfort performance of fire rescue suits in high temperature environment,theoretical formula derivation and calculation of thermal resistance of fire rescue clothing lining were studied,and relationship among particle size,thermal conductivity,filling angle and thermal resistance was deduced.Then,a three-dimensional model was made by using matlab to show the relationship between thermal resistance and the three.The results show that when particle size is smaller,filling angle and thermal conductivity were smaller,the thermal resistance will be greater.When the size is at a fixed value,isothermal resistance curve presents a parabolic trend.As filling angle increases,total thermal resistance R decreases first and then increases,but when it is fixed,the resistance curve is approximately a monotonic decreasing oblique line,and total thermal resistance decreases linearly with the increase of particle size and thermal conductivity.What is more,the thermal conductivity is constant,the isotherm is approximately a left hyperbola,and it has the largest particle size at a filling angle of about 0.92.