| Design of Thermal Barrier Coating System for Scramjet
using Coupled Thermo-Structural Analysis |
Anupam Purwar1, * and D. Roy Mahapatra2
pages : 242-249
DOI : 10.1080/0371750X.2016.1210024 |
| Abstract |
| Thermal barrier coating (TBC) is essential for scramjet structure to protect the metallic
structure from melting or developing high stress. In this perspective, a novel TBC
system with multiple layers of ceramics: top layer, intermediate layer, bond coat over
a suitable metal substrate has been proposed. First, material selection for TBC system
has been carried out based on their thermal conductivity and maximum operational
temperature. Then, an elaborate design methodology has been evolved to constrain
the temperature of each layer within their operational limit and minimization of thermal
mismatch. Different design parameters have been identified and iterative finite element
based thermo-structural analyses have been carried out to optimize them and hence,
limit metal substrate temperature within 1250 K and the maximum interfacial shear
stress within 80 MPa, when exposed to heat flux as high as 1.5 MW/m2 and pressure
greater than 1.3 bars. |
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