铝卷径向接触热阻的仿真研究

Simulation of the radial contact thermal resistance for the aluminum coil

对铝板进行加热试验,得到各测试点的温度数据。通过热传导反问题的求解,求得铝板间的等效导热系数,将其等效为铝卷径向导热系数,从而间接求得铝卷接触热阻,并推导出了铝卷强对流传热系数对温度的数学表达式。运用ANSYS有限元分析软件,综合考虑铝卷的导热系数和对流换热系数随温度变化的非线性,模拟了铝卷退火过程中的瞬态温度场。仿真结果表明,铝卷内部的温度与实测结果比较吻合,从而证明了试验方案和铝卷径向接触热阻求解方法的正确性,同时为铝卷退火工艺的优化提供了理论依据。

The temperature data of the test points was obtained through heating experiments on the aluminum sheet.The equivalent thermal conductivity between the aluminum sheets was resolved through heat conduction inverse solution,and its value was regarded as the radial thermal conductivity of the aluminum coil.Consequently,the contact thermal resistance was obtained indirectly,and the expression of the convective coefficient to the temperature was derived as well.The temperature field of the aluminum coil at transient state was simulated with consideration of the non-linearity of the radial thermal conductivity and convective coefficient and with the finite element analysis software of ANSYS.The results show that the inner temperature of aluminum coil is in line with the actual temperature measured,which proves that the experiment project and the solution method for radial contact thermal resistance are right approaches,and provides the theory basis for improving the annealing process of aluminum coil.