Heat Transfer Process in Jet Turbine Blade with Functionally Graded Thermal Barrier Coating

Abstract:

In the jet engine the temperature of exhaust gases should be as high as possible, from the point of view of its efficiency. The value of this temperature is limited by toughness of the turbine blades material. Superalloy Inconel 625, which is commonly used in aerospace industry, indicates 13% less yield point in 800^OC than in 25^OC. The temperature of exhaust gases can reach 1500^OC. The blade material has to be protected due to this fact. The one possibility of turbine blade protection is using of thermal barriers coatings (TBC). The coating has a very low thermal conductivity and therefore it protects against the thermal shock failure of the substrate material. The TBC can be manufactured as: 1) monocrystalline, 2) layered structures (e.g. [1-3]) or 3) as a functionally graded material (e.g. [4-7]). The differences between the properties of blade material and TBC can lead to significant increase of the high shear stresses in the substrate-TBC interface.In this paper numerical analyses of cooled turbine blade with various kinds of functionally graded thermal coatings were performed. The main aim was to find the optimal material properties distribution of the functionally graded TBC to avoid damage initiation and growth between TBC and substrate. In the calculations the effect of temperature on material properties both mechanical and thermal was taken into consideration.

• Periodical: Solid State Phenomena (Volume 254)
• Pages: 170-175
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.254.170
• Online since: August 2016
• Authors: Tomasz Sadowski*, Daniel Pietras
• Keywords: Ceramic Materials, Functionally Graded Materials, Thermal Barrier Coatings

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