Abstract
This paper investigates vibration and noise induced by unsteady flow inside a centrifugal compressor. A weakly coupled fluid-structure-sound method and extrapolation techniques are combined to simulate the multi-physics fields of internal flow, structural vibration and external noise. Some characteristic results, such as natural frequencies, vibration acceleration and sound pressure level, obtained from numerical simulations are compared with experimental data to validate the utilized numerical methods. The study emphasizes the difference of primary acoustic source position between aerodynamics and vibration. Furthermore, a response matrix is used to reveal coherence between the wall pressure fluctuation at the internal surface and the normal acoustic intensity at the external surface which offers meaningful guidelines of noise control.
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