基于先进激光加工技术的下一代航空发动机跨尺度整体式承力薄壁构件设计方法与应用

The multi-scale structure，composed of the macro skeleton，lattice and micro surface，represents a novel type of structure with potential for high performance，multifunctionality and lightweight design. Advanced laser processing technology not only enhances the manufacturing capacity of high-performance structures，but also provides possibilities for the manufacturing of new complex structures. After providing a brief overview of the current design and manufacturing techniques on macro skeleton，lattice and micro surface，this paper introduces a multi-scale structure design method for advanced laser processing technology. Taking the intermediate case of a turbine engine as an example，the main load-bearing skeleton is designed using topology optimization technology for additive manufacturing. The lightweight lattice design is carried out by filling manufacturable lattice in low-density areas in topology oiptimization or low-stress areas in the optimized model，resulting in a weight reduction of over 20% compared to the original design. Additionally，micro groove structures for drag reduction are designed on the surface of the airflow channel for ultrafast laser etching processing. Simulation results indicate that the micro grooves exhibit a drag reduction effect exceeding 10%. By exploring the multi-scale integrated structure design based on advanced laser processing technology，this study establishes a creative structural design procedure and offers a valuable approach for the development of next-generation aeroengine structures.