(上海交通大学 动力机械与工程教育部重点实验室，上海 200240)
摘 要: 基于四参数随机生长方法开发涂层微结构构造软件，构造层状涂层各向异性孔隙微结构，基于热阻网络方法开发涂层隔热性能分析软件，通过数值模拟分析不同孔隙大小、厚度和方向下层状涂层内部传热过程，得到层状涂层有效导热系数和稳态导热温度场。结果表明：提高涂层的孔隙率能有效地增强涂层隔热性能；孔隙率一定时，层状孔隙细小化会减弱涂层的隔热性能，但有利于稳态导热温度场的均匀分布，有利于涂层结构稳定；孔隙率一定时，层状孔隙细长化在一定程度上会增强涂层的隔热性能；孔隙率一定时，在0°~90°内，随着孔隙水平夹角的增大，涂层的隔热性能会有所减弱。且孔隙率越大，这种减弱趋势越明显。
关键字: 热障涂层；层状微结构；孔隙率；有效导热系数；隔热性能
（Key Laboratory for Power Machinery and Engineering, Ministry of Education,
Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:A software for constructing coating microstructure was developed based on the quartet structure generation set (QSGS), and the anisotropic pore microstructure of layered coating was constructed, also a software for analyzing the thermal insulation performance was developed based on thermal resistance network method. By numerical simulation, the heat transfer process within the layered coatings of different pore sizes, thicknesses and directions was analyzed, then, the coating effective thermal conductivity and thermal steady state temperature field were obtained. The results show that increasing the porosity of the coating can effectively enhance the thermal insulation performance of the coating. When porosity is constant, as the layered pores diameter decreases, its thermal insulation performance will be weakened, but the steady-state temperature distribution will be more uniform, and the structure will be more stable. When porosity is constant, as the layered pores elongating, its thermal insulation performance will be enhanced to some extent. When porosity is constant in the range of 0°-90°, as the horizontal angle of the layered pores increases, its thermal insulation performance will be weakened. And the higher the porosity, the more obvious the weaken trend.
Key words: thermal barrier coating; layered microstructure; porosity; effective thermal conductivity; thermal insulation performance
