Blade thickness effects on viscous flutter in a radial turbocharger turbine

Azadeh Sajedin, John Allport, Mohammadreza Amoozgar, Omid Farhangian Marandi

Research output: Contribution to journalArticlepeer-review

Abstract

Transient blade loading limits the lifetime of turbocharger turbine blades. This study investigates the flutter instability of a radial turbocharger turbine blade under pulsating inlet conditions. The viscous Navier-Stokes equations with the SST-kω turbulence model and curvature correction were solved. A time-marching 3D finite volume method was used in the CFX17 CFD solver to model the vibrating blade in a traveling wave mode applying Fourier Transformation. For flutter calculations, moving boundaries with specified modal displacements were used. An area of instability was recognized on the suction-side of the rotor blade. FSI steady-state analysis was then performed to assess the effects of shock position and blade profile on the blade stability in the recognized vulnerable region. The results show that a higher trailing edge radius increases the stability and leads to a significant reduction of flutter risk whereas the maximum thickness and leading-edge radius do not notably affect the flutter occurrences.
Original languageEnglish
Article number106139
Number of pages16
JournalEngineering Failure Analysis
Volume136
Early online date9 Feb 2022
DOIs
Publication statusE-pub ahead of print - 9 Feb 2022

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