热斗篷结构传输特性的[火积]评估模型

Entransy Evaluation Model for Transmission Characteristic of Thermal Cloak Metamaterial

作为一类热隐身超材料,热斗篷结构以良好的热防护和隐身特性在航天飞行器、遥感卫星、计算机芯片表面等处得到了广泛的应用。本文基于铜和PDMS材料交替而成的多层环形超材料结构,结合实际应用,在传统圆环形热斗篷的基础上,设计出两类超材料热保护器外形——梭形和导弹形的计算模型。利用ANSYS FLUENT14.5软件分别对三种热斗篷模型和无防护涂层的平板展开数值模拟。利用(火积)理论建立热力学评价指标。最终得到对两种优化模型热隐身效果分别在不同温差下(火积)评估指标随时间的分布情况。

Thermal cloak as one of thermal stealth metamaterial is applied to various fields such as the aerospace craft, satellite and computer chip, with its extraordinary physical properties. In this paper, based on the multilayer metamaterial structure using copper and PDMS materials, two kinds of thermal cloak shape were designed as fusiform and missile. Numerical simulations were carried out using FLUENT14.5 software, to calculate the heat transfer thermal cloak models of different shapes. To evaluate thermal stealth ability, thermal stealth rate was proposed based on entransy dissipative extreme value theories. Then the thermodynamic perfbrmance of tile optima models were discussed under different conditions, using thermal stealth rate, which provided a frame of reference on application widely.