羽绒制品热传递的有限元仿真

Finite element simulation of heat transfer through down coat panel

针对现有羽绒制品保暖性测试方法的测试时间较长、成本较高等不足,提出一种数值模拟测试方法。采用ANSYS有限元软件建立“羽绒-织物-皮肤”的三维几何模型,模拟分析不同织物、不同填充密度、不同绗缝数量条件下模型内部与外表面的温度分布特征,探究不同条件对热量沿厚度方向和宽度方向传递的影响,计算其保暖性,并进行实验验证。结果表明:羽绒填充密度增加,热量沿模型厚度方向的传递距离增大,外表面温度及热流密度减小;绗缝数量增加,热量沿模型厚度方向的传递增大,沿模型宽度方向的传递距离减小,外表面温度及热流密度逐渐增大;织物对羽绒制品保暖性的影响较小;模拟结果与实验结果的最大相对误差为4.79%,二者吻合度较好。

A numerical simulation method was proposed to address the shortcomings associated to the existing down product warmth test,such as long testing time and high cost.ANSYS finite element software was used to establish a three-dimensional geometric model of"down-fabric-skin".The temperature distribution characteristics of the internal and external surfaces of the model with different fabrics,different filling densities and different number of quilts were simulated and analyzed,the influence of different conditions on the heat transfer along the thickness and width directions were studied and its clo values calculated,and experimental validation was carried out.The results show that the heat transfer distance along the thickness direction of the model increases with the increase of down filling density,and the temperature and heat flow density of the outer surface decreased.The heat transfer along the thickness direction of the model increased with the increase of the number of quilting,and the heat transfer distance along the width direction of the model decreased,and the temperature and heat flow density of the outer surface gradually increased.The influence of fabric on the warmth of down products was small,and the maximum relative error between simulated and experimental clo values is 4.79%,indicating good agreement between the two.