Experimental investigation on effects of rough woven morphological features on surface of ceramic matrix composite turbine blades on convective heat transfer

Ceramic Matrix Composites (CMCs) are used in aero-engine turbine blades due to their excellent high-temperature resistance. However, as a result of the interlaced arrangement of woven fibers, the surface of CMC blades exhibits woven morphological features, which affect their convective heat transfer characteristics. This study conducts experimental investigations on convective heat transfer over rough surfaces of 2D woven SiC f /SiC turbine blades. The effects of mainstream turbulence intensity, woven morphology height, width, and orientation on heat transfer performance are analyzed under varying pressure gradients of the blade. The results indicate that in the favorable pressure gradient region, the geometric dimensions of morphological features and variations in mainstream parameters significantly influence the heat transfer performance. Increased inlet turbulence intensity enhances the overall heat transfer level and affects the transition location of the boundary layer. As the height of the morphology increases, the average Nusselt number also increases. At a height of 0.6 mm, the average surface Nusselt number improves by 52.5% compared to a smooth blade. In contrast, as the morphology width increases, the heat transfer performance gradually decreases. Consequently, thermal load optimization in distinct regions can be achieved by adjusting the morphology parameters of CMC.