Integrated optimization and thermodynamic characteristic analysis of adjustable splitter in a variable cycle compression system

• Published in: Applied thermal engineering 2025-03, Vol.263, p.125354, Article 125354
• Main Authors: Luo, Qiaodan, Zhao, Shengfeng, Wang, Haoran, Zhou, Shiji, Yao, Lipan, Yang, Chengwu, Lu, Xingen, Zhu, Junqiang
• Format: Article
• Language: English
• Subjects: Adjustable splitter design; Dissipation losses; Dynamic Kriging model; Joint optimization framework; Variable cycle compression system
• ISSN: 1359-4311
• DOI: 10.1016/j.applthermaleng.2024.125354

•Proposing a novel adjustable splitter tailored for complex variable cycle compression system.•Considering the real coupling effects between the splitter and the adjacent components.•Introducing the bypasses dissipation coefficient and component efficiency as constraint.•Achieving multi-objective optimization through Kriging-NSGA-II-TOPSIS framework. With the rapid advancement of new turbofan engine technologies, the development of an adjustable splitter design (ASD) method has become critical for enhancing the performance of complex compression systems. This study addresses the challenge of optimizing ASD for variable double bypass compression systems (VDBCS), introducing a novel automatic optimization framework that integrates dynamic Kriging surrogate models, multi-objective genetic algorithms, and the TOPSIS method. The framework is designed to minimize the total pressure loss coefficient across the double bypasses, while simultaneously constraining local dissipation coefficients near the splitter and maintaining component efficiencies. This approach effectively accounts for the coupled interactions between the bypasses and other components within the compression system. The research findings indicate that the optimized splitter has a stronger blunt head characteristic, the incidence characteristic of the splitter is significantly improved by rotating downward at reasonable angle, and the shock wave on the leading edge is effectively eliminated. With the optimized solution, the total pressure loss coefficients of the external and core bypasses decreased by 11.922% and 9.359% respectively. The local dissipation coefficient near the splitter decreased by 26.996%, while maintaining high efficiencies of the compression system components. This optimization framework demonstrates feasibility and effectiveness in aerodynamic optimization of splitter within VDBCS. In the future, more real-world factors such as material properties, structural integrity, will be considered in the framework to improve its accuracy and adaptability for diverse applications.