Van Vinh Nguyen, Oleg V. Repetckii

Irkutsk State Agrarian University named after A.A. Ezhevsky

Studying the durability of impellers of the turbomachine taking into account the intentional mistuning parameters using sensitivity analysis, which differ in the geometric complexity of structures, requires large computing resources. In this regard, it is necessary to develop methods in order to reduce the required computer costs (memory, speed), thereby reducing the complexity of simulation and speeding up the design process. This paper presents a mathematical model for optimizing the introduction of intentional mistuning in order to obtain structures with increased durability. The article is devoted to the application of mathematical models for predicting and optimizing the fatigue life of an axial bladed disk with intentional mistuning based on the finite element method (FEM). A numerical study of the introduction of intentional mistuning based on the created mathematical models of the dynamic load of turbomachine blades and estimation of resource characteristics has been carried out. The ANSYS WORKBENCH software package and original author's programs were used to study the effect of intentional mistuning of the bladed disk. The object of this research is an academic bladed disk with 10 blades, manufactured at the Brandenburg University of Technology. Using the obtained results in this work makes it possible to increase the efficiency and reliability at the design stage of turbomachine bladed disk parts. On the basis of such results, it is possible to provide the necessary accuracy of calculations and conduct computational experiments to study the effect of intentional mistuning parameters on the durability of axial impellers.

academic impeller, geometric change, durability, finite element method, optimization, intentional mistuning