Analysis of intentional mistuning parameters at change the thickness of radial blades of turbomachines
Introduction. This article is devoted to mathematical models and methods for optimizing the design parameters and the regime works of radial impellers of power and other turbomachines, used in ventilation, drying and other technological processes in the AIC (agro-industrial complex). The calculation of natural frequencies, static stresses and the values of the maximum displacement magnification radial impellers are presented. These calculations make it possible to significantly reduce the volume of expensive experimental studies and reduce the time for designing new machines according to the criteria of efficiency, reliability and resource saving of highly loaded aggregates. Materials and methods. The object of study in this work is a radial impeller with 10 blades manufactured by the company «Schiele» (Germany), which specializes in the production aggregates for the chemical industry, agriculture and ventilation equipment. The finite element method was used using the TET10 finite element from the program ANSYS WORKBENCH to study natural frequencies, static stresses, the reliability of technical systems and equipment in the AIC. The value of the maximum displacement magnification radial impellers of power turbomachines are calculated on the basis of our own program. Results and discussion. The results of a numerical study are presented of the effects intentional mistuning in order to reduce the maximum displacement magnification of turbomachine blades. Intentional mistuning was obtained by small changes in the geometry of the blades, in the form reduction / increase in the thickness of the radial blades by 0,2 mm and the introduction of intentional mistuning parameters. Conclusion. In this work, the results can be safely assumed that the study of changes in the thickness of the radial blades of power turbomachines is relevant at stages of design, development and optimization of these structures. The geometric characteristics of bladed disk have been changed and significantly affect their dynamic characteristics, durability, increases their efficiency and reliability in the AIC.