Numerical analysis of flow-induced noise in a high-speed centrifugal compressor

Sharma, S. (Speaker), Allport, J. (Speaker)

Activity: Talk or presentation typesInvited talk

Description

A numerical approach to investigate the flow induced noise and corresponding mechanisms for a small high-speed centrifugal compressor is presented in this work. A turbocharger compressor with a widely used passive flow enhancement solution (ported shroud) is selected as the subject of this study. The research on the acoustic effects of the ported shroud design is limited. Therefore, the acoustic characteristics of the compressor are experimentally determined by measuring ‘in-duct’ noise at inducer and diffuser locations. The compressor is then numerically modelled using state of the art statistical and scale resolving turbulence modelling approaches. The operation of the compressor is modelled at both design and near surge condition using Large Eddy Simulation (LES), Stress Blended Eddy Simulation (SBES), Detached Eddy Simulation (DES) and unsteady Reynolds Averaged Navier-Stokes Simulation (uRANS). Furthermore, the impact of spatial and temporal discretisation is also quantified by using different mesh sizes and time step sizes. The results demonstrate the strength and limitations of various modelling configurations in accordance with their computational efficiency. Both tonal and broadband noise features are seen to be captured by a numerical model with the exception of a broadband noise caused by the interaction of swirling flow with a structural feature. In addition to that, the instantaneous pressure field is decomposed using Proper Orthogonal Decomposition (POD) with an intent to quantify a relationship between dominant flow features and their corresponding acoustic emission for the aforementioned operating conditions.
Period22 Jan 2019 - 24 Jan 2019
Held atSAE - International Powertrains, Fuels & Lubricants Meeting
Event typeConference
LocationSan Antonio , United States
Degree of RecognitionInternational