Effects of the coating type and yarn fiber volume fraction on the coupling heat transfer characteristics for the ceramic matrix composite plate

Ceramic matrix composites (CMCs) are recognized as optimal materials for future aero-engine applications due to their low density and excellent high-temperature resistance performance. However, the anisotropic thermal conductivity presents substantial challenges in thermal analysis, which restricts the application to high-temperature components. In this paper, a 2D woven structure model of a CMC plate was reconstructed using 3D Computed Tomography (CT) scanning technology based on its actual structure. Then, numerical simulations were conducted to investigate the coupling heat transfer characteristics of the CMC plate, focusing on different coating types and yarn's fiber volume fractions (V). The results reveal that the overall cooling effectiveness derived from the woven structure model differs from that of the homogeneous model, as the latter fails to capture the temperature gradient differences between the yarn and the matrix. As V increases from 0.2 to 0.5, the overall cooling effectiveness decreases by 2.4 %, and the temperature gradient differences between the yarn and the matrix become more pronounced. Furthermore, applying coatings to the CMC plate intensifies the temperature gradient differences across various regions and enhances the overall cooling effectiveness by up to 2.2 %.