Abstract
A casing treatment of centrifugal compressor for turbochargers is a very important device in aerodynamic performance improvement because it enables to expand an operating range of compressor. However, a rib existing in the circulation flow path of casing treatment is one of the factors causing a resonance problem. In this study, the relationship between a casing treatment and blade vibration was investigated by frequency response analysis that combines computational fluid dynamics and finite element method. As a result, it was clarified that the difference in the amount of vibration response and the excitation mechanism by the existence of rib.
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