换热系数对热机耦合作用下热障涂层性能的影响
Effect of different heat transfer coefficients on the performance of thermal barrier coatings under thermo-mechanical couple process
-
摘要: 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.
-
关键词:
- 航空、航天推进系统 /
- 热障涂层(TBCs) /
- 热氧化生成层(TGO) /
- 换热系数 /
- 有限元方法(FEM)
Abstract: 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. -
[1] Siegmann S D,Brown C A.Scale-sensitive fractal analysis for understanding the influence of substrate roughness in thermal spraying[C]//In:Berndt C C.Proceedings of the First United Thermal Spray Conference.Materials Park,OH-USA:ASM International,1998:149-158. [2] Dayanda M A,Sohn Y H.Interdiffusion between MCrAIY coatings and selected Ni-base alloys[C]//In:Narendra B D,Janet M H,Jacob J,et al.Proceedings of the Symposium on High Temperature Coatings-I,War-rendale,Pennsylvania:Minerals,Metals & Materials Society,1995:107-120. [3] Kulkarni A,Goland A,Herman H,et al.Advanced neutron and X-ray techniques for insights into the microstructure of EB-PVD thermal barrier coatings[J].Materials Science and Engineering,2006,A426:43-52. [4] LIU Aiguo,WEI Yanhong.Finite element analysis of anti-spallation thermal barrier coatings[J].Surface and Coatings Technology,2003,165:154-162. [5] Busso E P,Wright L,Evans H E,et al.A physis-based life prediction methodology for thermal barrier coating systems[J].Acta Material,2007(55):1491-1503. [6] Chang G C,Phucharoen W.Finite element thermal stress solutions for thermal barrier coatings[J].Surface and Coatings Technology.1987(32):307-325. [7] ZHOU Chungen,WANG Na,XU Huibin.Comparison of thermal cycling behavior of plasma-sprayed nanos-tructured and traditional thermal barrier coatings[J].Materials Science and Engineering,2007:569-574. [8] Tzimas E,MUllejans H,Peteves S D,et al.Failure of thermal barrier coating systems under cycle thermomechanical loading[J].Acta Mater,2000(48):4699-4707. [9] 曹玉璋,陶智,徐国强,等.航空发动机传热学[M].北京:北京航空航天大学出版社,2005. -
点击查看大图
计量
- 文章访问数: 1448
- HTML浏览量: 116
- PDF量: 440
- 被引次数: 0
下载: