热辐射对双陶瓷层热障涂层的隔热影响

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.双陶瓷层在不透明时,顶层厚度增加,顶层上表面温度线性增加,第二层和黏结层上表面温度线性降低.在半透明性弱时,与不透明情况类似.在半透明性强时,顶层上表面温度略低于不透明时,第二层上表面温度高于不透明时,黏结层上表面温度先快速后缓慢降低再保持不变,且远高于不透明时.

Effect of heat radiation on the thermal insulation of double-ceramic-layer thermal barrier coatings

Opaque and translucent physical models of double-ceramic-layer thermal barrier coatings(DCL-TBCs) were established with the theory of heat conduction,convection and radiation.The steady temperature field was simulated with ANSYS software.When the ceramic is opaque,with the top ceramic layer thickness increasing,the upper side temperature of the top ceramic layer linearly increases,but that of the second ceramic and bonding layers linearly decrease.When the double ceramic is weakly translucent,the trend of temperature is similar to the opaque’s.When the ceramic is highly translucent,with the top ceramic layer thickness increasing,the upper side temperature of the top ceramic layer is a little lower and that of the second ceramic layer is higher than the opaque’s;the upper side temperature of the bonding layer firstly fast,secondly slowly decreases and then keeps constant,but much higher than the opaque’s.