换热系数对热机耦合作用下热障涂层性能的影响

通过有限元计算分析了热机耦合作用下的热障涂层不同的内壁换热系数对涂层系统隔热效果和应力分布的影响,为选择合适的内壁换热系数提供了参考作用.计算结果表明:随着内壁换热系数的增加模型中的温度随之降低,内外壁的温差以非线性曲线的形式增加;在热氧化生成层附近产生了较大的应力,并且主应力值随着换热系数的增加而增大.

Effect of different heat transfer coefficients on the performance of thermal barrier coatings under thermo-mechanical couple process

The heat insulation and stress distribution in thermal barrier coatings(TBCs) with different inner wall heat transfer coefficients were studied via finite element method(FEM),laying a foundation for the selection of heat transfer coefficients.The results show that,the temperature of model decreases with the increase of the inner wall heat transfer coefficients,meanwhile,the temperature difference between inner and outer walls increases non-linearly.The maximum stress occurs near the thermally grown oxide(TGO) layer,and its value increases with the increase of heat transfer coefficients.