摘要
为了研究等离子喷涂ZrO2-8%(质量分数)Y2O3热障涂层系统在对流换热过程中的力学性能,以涡轮机叶片热障涂层为分析对象,结合传热学理论,通过热-结构耦合有限元计算方法对涂层与环境换热过程进行模拟仿真,重点分析换热系数以及升温速率对叶片残余应力演变的影响。研究结果表明,涂层上表面对流换热系数越大,在升温结束时残余应力越大。对流换热系数固定时,随着升温速率的提高,最大残余应力先增大再减小,给出了对流换热系数以及升温速率的合理区域。
To study the mechanical behavior of plasma spraying ZrO_2-8%Y_2O_3 （ mass fraction） Y_2O_3 coating system in the process of convective heat transfer, the paper analyzed the thermal barrier coating of turbine blade and presented simulation on the coating and process of heat transfer. The study was achieved by combining heat transfer theory and thermal-mechanical finite element method. The results indicate that residual stress grows with the increase of heat transfer coefficient of coating surface. Findings also show that the maximum residual stress value increases first and then decreases, with the increase of heating rate when the heat transfer coefficient is fixed and heating rate changed. The research suggests some references to the choice of heat transfer coefficient and heating rate which are provided with reasonable areas.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2014年第5期63-68,共6页
Journal of Aeronautical Materials
