Vibration analysis and numerical simulation of fluid–structure interaction phenomenon on a turbine blade

• Published in: Journal of the Brazilian Society of Mechanical Sciences and Engineering 2021-05, Vol.43 (5), Article 245
• Main Authors: Elhami, M. Reza, Najafi, Mohammad Reza, Tashakori Bafghi, Mohammad
• Format: Article
• Language: English
• Subjects: Blade tips; CAD; Centrifugal force; Computational fluid dynamics; Computer aided design; Coupled modes; Coupling; Displacement; Engineering; Fluid flow; Fluid-structure interaction; Frequency variation; Mechanical Engineering; Modal analysis; Pressure; Pressure effects; Rotors; Technical Paper; Turbine blades; Turbines; Vibration analysis; Working conditions
• ISSN: 1678-5878; 1806-3691
• DOI: 10.1007/s40430-021-02933-6

In this paper, the vibrational analysis of the turbine blade and the effect of pressure on the rotor surface in the fluid–structure interaction are investigated. Due to the complex and specific working conditions of a turbine blade, the FSI phenomenon, as well as modal analysis, has been investigated in this work. The turbine blade was exposed to centrifugal force and fluid forces due to high pressure working conditions. The simulation of the turbine blade has been carried out by ANSYS software, and the results were validated; then, fluid and structure coupling, displacement rate and vibration frequency variation of turbine blades were investigated at different inlet fluid velocities. For analysis of the results, the turbine blade tip deviation and its impact on the fluid flow pressure have been considered. Besides, the effect of surface pressure, as well as tip displacement on the vibrational frequency variations, was investigated. As the inlet velocity of the fluid flow increases, the applied pressure on the rotor increases and as a result the vibration amplitude also increases. The linear variation of transverse displacement along the blade was obtained. Also, the results of two-way coupling show that the pressure variation on the rotor in the coupled mode is less significant than in the uncoupled mode. The amount of applied pressure on surface moves from the front to the center of the rotor, and also the pressure increases at the downside and decreases at the top of the rotor in the coupled mode.