Shape optimization of a leading-edge and junction region shape around an airfoil/flat-plate, which improves aerothermal characteristics, is presented. The shapes around airfoil/flat-plate effectively reduce secondary flow loss, which is generated in the leading-edge and the junction region. This investigation focused on finding a leading-edge and junction region shape with minimum total pressure loss in the downstream and heat transfer level on the leading-edge and the junction region. An approximate optimization method was used for the investigation to secure the computational efficiency. The design variables were the leading-edge and junction region shape factors. Results indicated that a significant improvement in aerothermal environment can be achieved through the application of the optimized leading-edge and junction region shape. The optimized design reduced the mass-weighted average total pressure loss in the wake region by 4.9% relative to the baseline. The area-weighted average maximum Nusselt number on the leading-edge and junction region endwall of the optimized design was decreased by 4.6% in comparison to the baseline.
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