Simulations and measurements of automotive turbocharger compressor whoosh noise

Turbocharger noise has become a major concern in downsized automotive engine development. In this paper, the analysis is focused on the whoosh noise produced by the compressor when it is working near surge. A centrifugal compressor has been acoustically characterized on a turbocharger test rig mounted on an anechoic chamber. Three in-duct pressure signals forming a linear array are registered in order to obtain pressure components. In this way, meaningful pressure spectra and sound intensity level (SIL) compressor maps are obtained, showing an increase of SIL in the frequency window corresponding to whoosh noise. Besides, detached eddy simulations (DES) of the centrifugal compressor flow in two operating conditions near surge are performed. Good agreement is found between the experimental measurements and the CFD solutions in terms of predicted pressure spectra. Flow analysis is used to identify patterns responsible for the different features of the pressure spectra. At the simulated conditions, rotating instabilities in the compressor diffuser and inducer cause pressure oscillations in the frequency range of whoosh noise.

[1]  Michael Tritthart,et al.  Three-Dimensional Simulation of Free-Surface Flows Using Polyhedral Finite Volumes , 2007 .

[2]  Abdelkrim Zouani,et al.  Computational Aero-Acoustics Simulation of Compressor Whoosh Noise in Automotive Turbochargers , 2013 .

[3]  Dominic Evans,et al.  THE REDUCTION OF TURBOCHARGER WHOOSH NOISE FOR DIESEL POWERTRAINS , 2006 .

[4]  Fred Mendonça,et al.  Automotive Turbocharger Compressor CFD and Extension Towards Incorporating Installation Effects , 2011 .

[5]  J. Galindo,et al.  Influence of tip clearance on flow behavior and noise generation of centrifugal compressors in near-surge conditions , 2015 .

[6]  Ahmet Selamet,et al.  Design of a Multi-Chamber Silencer for Turbocharger Noise , 2009 .

[7]  Sergio Hoyas,et al.  Set-Up Analysis and Optimization of CFD Simulations for Radial Turbines , 2013 .

[8]  Ahmet Selamet,et al.  Noise at the mid to high flow range of a turbocharger compressor , 2014 .

[9]  Carlos Guardiola,et al.  Surge limit definition in a specific test bench for the characterization of automotive turbochargers , 2006 .

[10]  Charlie Teng,et al.  Investigation of Compressor Whoosh Noise in Automotive Turbochargers , 2009 .

[11]  Wolfgang Neise,et al.  Sound Generation in Centrifugal Compressors , 2008 .

[12]  Luis Vergara,et al.  Estimation of velocity fluctuation in internal combustion engine exhaust systems through beamforming techniques , 2000 .

[13]  C. L. Morfey,et al.  Sound transmission and generation in ducts with flow , 1971 .

[14]  Antonio J. Torregrosa,et al.  Development of Non-Reflecting Boundary Condition for Application in 3D Computational Fluid Dynamics Codes , 2012 .

[15]  Walter Knecht,et al.  Diesel engine development in view of reduced emission standards , 2008 .

[16]  Geoff Capon,et al.  Simulation of Radial Compressor Aeroacoustics Using CFD , 2012 .

[17]  X. Margot,et al.  Optimization of the inlet air line of an automotive turbocharger , 2013 .

[18]  Laszlo Fuchs,et al.  Numerical flow analysis of a centrifugal compressor with ported and without ported shroud , 2014 .

[19]  José Galindo,et al.  Methodology for experimental validation of a CFD model for predicting noise generation in centrifugal compressors , 2014 .