Blade thickness effects on viscous flutter in a radial turbocharger turbine

Sajedin, Azadeh; Allport, John; Amoozgar, Mohammadreza; Farhangiyan Marandi, Omid

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.

Citation

Sajedin, A., Allport, J., Amoozgar, M., & Farhangiyan Marandi, O. (2022). Blade thickness effects on viscous flutter in a radial turbocharger turbine. Engineering Failure Analysis, 136, Article 106139. https://doi.org/10.1016/j.engfailanal.2022.106139

• Journal Article Type: Article
• Acceptance Date: Feb 7, 2022
• Online Publication Date: Feb 9, 2022
• Publication Date: 2022-06
• Deposit Date: Mar 1, 2022
• Publicly Available Date: Feb 10, 2023
• Journal: Engineering Failure Analysis
• Print ISSN: 1350-6307
• Publisher: Elsevier BV
• Peer Reviewed: Peer Reviewed
• Volume: 136
• Article Number: 106139
• DOI: https://doi.org/10.1016/j.engfailanal.2022.106139
• Keywords: General Engineering; General Materials Science
• Public URL: https://nottingham-repository.worktribe.com/output/7531456
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S1350630722001133?via%3Dihub