ТОПОЛОГІЧНА ОПТИМІЗАЦІЯ ВЕНТИЛЯТОРА ТУРБОРЕАКТИВНОГО ДВОКОНТУРНОГО ДВИГУНА З УРАХУВАННЯМ МІЦНІСНИХ ХАРАКТЕРИСТИК ДВОРЯДНОЇ ЛОПАТКИ

<jats:p>In modern mechanical engineering, particularly in aircraft engine design, the development of structures capable of operating under significant mechanical, aerodynamic, and vibration loads is a relevant engineering task. At the same time, it is important not only to ensure the required strength and stiffness of structural elements but also to minimize their mass, since this directly affects the efficiency, service life, and operational characteristics of the entire system.The subject of the study is the topology optimization of a two-row fan blade of a turbofan engine. The object of the study is a two-row fan blade of a turbofan engine. The aim of the work is to minimize the mass of an aircraft engine fan blade by means of topology optimization.The research tasks include performing topology optimization of the fan blade based on the results of aerodynamic and structural strength analyses, as well as developing a three-dimensional model of the fan blade taking into account the results of topology optimization.The study was carried out using a numerical experiment in the Ansys Workbench Student software environment. CFD, FEM, and topology optimization methods were used to solve the problem.The results of the optimization showed that part of the internal volume of the blade has lower structural significance and can be removed without a critical reduction in the load-bearing capacity of the structure. Based on the obtained data, an optimized blade model with an internal cutout was developed, while the external aerodynamic contour, root section, and main load-bearing regions were preserved.The mass of the optimized blade was reduced by 29.36% compared with the initial design. The analysis of equivalent stresses showed a redistribution of stresses after the removal of internal material; however, their level remained close to that of the initial model. The safety factor of the optimized blade remains within the allowable range, confirming that the structural performance of the blade is preserved. At high flow velocities, the optimized blade demonstrates better strength characteristics than the baseline design.The scientific novelty and practical significance of the study consist in obtaining new data on the possibility of applying topology optimization to reduce the mass of a two-row aircraft engine fan blade without critical deterioration of its strength characteristics. The practical significance of the work lies in the development of a lightweight blade structure with an internal cutout that preserves the external aerodynamic profile and the required load-bearing capacity.The proposed design solution can be used in the further development of advanced turbofan engines. It also requires additional verification in terms of fatigue strength, vibration resistance, and manufacturing feasibility.</jats:p>