Shape-preserving mesh deformation method of perforated surfaces and application to double-wall turbine blade leading edge

A Hybrid Free-Form Deformation (HFFD) method is developed to improve shape preservation in mesh deformation for perforated surfaces, which traditional Free-Form Deformation (FFD) techniques struggle to handle effectively. The proposed method enables high-fidelity parameterized deformation for both flat and curved perforated surfaces while maintaining mesh quality with minimal geometric distortion. To evaluate its effectiveness, comparative studies between HFFD and conventional FFD methods are conducted, demonstrating superior performance in mesh quality and geometric fidelity. The HFFD-based framework is further applied to the Multidisciplinary Design Optimization (MDO) of a double-wall turbine blade leading edge. Results indicate an 11.6 % increase in cooling efficiency and a 16.21 % reduction in maximum stress. Additionally, compared to traditional geometry-based parameterization in MDO, the HFFD approach improves model processing efficiency by 84.15 % and overall optimization efficiency by 20.05 %. These findings demonstrate HFFD's potential to significantly improve complex engineering design optimization by achieving precise shape preservation and improving computational efficiency.