双陶瓷层热障涂层的隔热行为有限元模拟研究

Finite element analysis of thermal insulation in double-ceramic-layer thermal barrier coatings

基于热传导、热对流和热辐射理论建立了双陶瓷层热障涂层不透明和半透明物理模型,采用有限元ANSYS软件模拟了稳态温度场。结果表明双陶瓷层在不透明时,随总厚度或顶层厚度增加,顶层上表面温度近似线性增加,第2层和粘结层上表面温度近似线性降低。在陶瓷层半透明条件下,衰减系数对各层温度有一定影响。在衰减系数很大时,各层温度与不透明情况类似;在衰减系数较小时,顶层上表面温度略低于不透明时,第2层上表面温度略高于不透明时,粘结层上表面温度先快速后缓慢降低并保持不变,且远高于不透明时,界面反射能降低各层温度。

The opaque and translucent physical models of double-ceramic-layer thermal barrier coatings were established with theory of thermal conduction and convection and radiation.The steady temperature field was simulated with ANSYS software.The results show that when the double ceramic is opaque,the thickness of double or top ceramic layer increases,upper side temperature of top ceramic layer increases nearly linearly,and upper side temperature of second ceramic and bonding layer decrease nearly linearly.When the double ceramic is weakly translucent,the trend is similar to opaque.When the double ceramic is highly translucent,the thickness of top ceramic layer increases,upper side temperature of top ceramic layer is a little lower than opaque,and upper side temperature of second ceramic layer is higher than opaque,and upper side temperature of bonding layer firstly fast and slowly increases and keeps no change,but much higher than opaque,and reflection has some effect on reducing temperature of every layer.