Van Vinh Nguyen, Oleg V. Repetckii

Irkutsk State Agrarian University named after A.A. Ezhevsky

The article is devoted to the development and application of mathematical models to study the effect of intentional mistuning on the durability of the impellers of power turbomachines by the finite element method (FEM). A numerical study of the introduction of intentional mistuning and optimization of the life characteristics of power turbomachines based on the created or developed mathematical models of the dynamic load of turbomachine blades and the assessment of life characteristics has been carried out. Using the obtained mathematical models and the numerical FEM method in this work makes it possible to increase the efficiency and reliability of new designs at the stage of designing and finishing the rotor parts of turbomachine impellers. It is confirmed that on the basis of the created mathematical models and a set of programs, it is possible to obtain the necessary accuracy of calculations and conduct computational experiments to assess the effect of deliberate mistuning of parameters in ideal cyclic symmetric systems and systems with mistuning. It is confirmed that on the basis of the created mathematical models and complex of programs, it is possible to obtain the necessary accuracy of calculations and conduct computational experiments to assess the effect of intentional mistuning in ideal cyclic symmetric systems and systems with mistuning. The ANSYS WORKBENCH software package and original author's programs were used to study the effect of intentional mistuning of the impellers of turbomachines. The object of the study is an academic impeller with 10 blades, which is manufactured at the Brandenburg University of Technology.

academic impeller, durability, mathematical models, finite element method, intentional mistuning