Theoretical Analysis of Heat Transfer Through an Idealized Gas Turbine Blade Model with Thermal Barrier Coating

ORHAN AYDIN ； MISAO IWATA ； NOROI ARAI ； WEN-JEI YANG

《International Journal of Rotating Machinery》 2002卷 (2002/12) Pp. 81-86

https://doi.org/10.1155/S1023621X02000088

摘要

In this study, a simplified gas turbine blade model is considered in order to investigate the effectiveness of a new thermal barrier coating material. The model consists of two concentric cylinders with high temperature gas flow in the annular space and with low temperature liquid in the inner cylinder whose exterior surface is coated with thermal barrier coating material having high emissivity. The new coating material, which was developed by the Noritake Co. Ltd., is silica-based glass ceramic. A control volume approach is used for gas and liquid flows, while surface energy balance is used for the surfaces of the inner and outer cylinders. Results obtained for the new coating material are compared with those obtained for the materials with lower emissivities and zero emissivity, that is, the case in which radiation effect is neglected. It is disclosed that a gas turbine blade coated with the new thermal barrier coating material, glass-ceramic, results in higher heat transfer rates, which in turn enhance power output.

關鍵字

Gas turbine blade ； Thermal barrier coating ； Glass-ceramic ； Radiative heat transfer ； Enhancement