Flutter Analysis of Rotor Based on a Fluid–Structure Method

Abstract

The vibration that occurs in every rotating element (specifically in turbomachinery elements) generates effects that modify its operation and therefore its performance, which causes the system to compromise and not operate in nominal conditions. Of all the types of vibration that can occur due to various sources of excitement: body or flow scattering, what is clear is the generation of a forced vibration: where a self-excited vibration is generated and whose source energy It generates dynamic instability, which can lead to catastrophic failures due to the complexity of predicting these effects during design. Recent studies focus on aeroelasticity in the rotating elements, when using this approach, the elasticity equations and the aerodynamic forces generated in the blades are used, thus obtaining the equations of aeroelasticity, thus these equations are discretized and it is solved numerically to obtain the corresponding approximations.

The present work presents a structural model of a rotor considering the shifts that are presented by the fluid, for this case the complete rotor is studied not before analyzing the behavior of the flow in a blade, thereby obtaining displacements in the structure due to the flow and with it the vibration modes in the blade. The analysis in the blade is performed by FEM and CFD to obtain the behavior of the vibration modes considering the flow.