Thermal stress and CFD analysis of coatings for high-temperature corrosion

Kadir, A; Beg, OA

Abstract

Modern gas turbine blades experience significant thermal loading during expected life cycles. Temperatures can attain in excess of 1000 Celsius. It is therefore necessary to coat the blades with thermal barrier coatings (TBCs) which also provide protection from oxidation, corrosion, debris impact and thereby mitigate possible failures. Additionally, there are high centrifugal stresses and shock loadings present. Many excellent studies have been conducted on the performance of TBCs in real systems. It has been established that temperature decay across TBCs is a function of material and geometrical properties of the TC layer, in particular the thickness of the layer and thermal conductivity. Ceramics have emerged as the most resilient to high temperature conditions, although cracking may occur and other discontinuities may appear under long duration exposure to corrosive gases. In the current work we employ the ANSYS structural and FLUENT tools to perform computational stress analysis and high temperature flow analysis on bare (unprotected) and titanium or ceramic (SiC) coated gas turbine blade samples. A three dimensional model is produced in both cases. Body meshing is achieved with tetrahedron cells. A mesh independence study is included to verify the results, which provide a compliment to on-going experimental studies also being undertaken by the authors.

Citation

Kadir, A., & Beg, O. (2018, August). Thermal stress and CFD analysis of coatings for high-temperature corrosion. Poster presented at ICHTFM 2018 : 20th International Conference on Heat Transfer and Fluid Mechanics, Istanbul, Turkey

• Presentation Conference Type: Poster
• Conference Name: ICHTFM 2018 : 20th International Conference on Heat Transfer and Fluid Mechanics
• Conference Location: Istanbul, Turkey
• Start Date: Aug 16, 2018
• End Date: Aug 17, 2018
• Acceptance Date: Jul 19, 2018
• Deposit Date: Jul 20, 2018
• Publisher URL: https://waset.org/conference/2018/08/istanbul/ICHTFM
• Additional Information: Event Type : Conference