Computational Aero-Acoustics Simulation of Compressor Whoosh Noise in Automotive Turbochargers

Karim, Ahsanul; Miazgowicz, Keith; Lizotte, Brian; Zouani, Abdelkrim

doi:10.4271/2013-01-1880

Cited by 34 publications

(29 citation statements)

References 5 publications

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“…Nonetheless, the whoosh noise is more apparent at near-surge operating conditions than at actual deep-surge operating conditions (Evans and Ward 12 and Broatch et al 1 ). Karim et al 15 relate an unfavorable incident angle at the leading edge of the compressor blade with the noise generation and Broatch et al 1 suggest rotating flow structures in the blade passages as the cause for the whoosh noise. However, Evans and Ward 12 have found that the main noise source is located further downstream in the compressor outlet hose.…”

Section: Introductionmentioning

confidence: 98%

Centrifugal Compressor: The Sound of Surge

Sundström

Semlitsch

Mihăescu

2015

21st AIAA/CEAS Aeroacoustics Conference

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When a centrifugal compressor operates at low mass flow rates (close to the unstable operating condition called surge), flow instabilities can develop and severe flow reversal may occur in the wheel passage. Under such conditions, noise generation has been reported resulting in a notable discomfort induced to the passengers in the cabin.The aim with this study is to predict the flow field associated with a centrifugal compressor and characterize the acoustic near-field generation and propagation under stable and off-design (near-surge) operating conditions. The Large Eddy Simulation (LES) approach is employed. The unsteady features in the flow field leading to acoustic noise generation are quantified by means of statistical averaging, Fourier data analysis and flow mode decomposition techniques. The decomposition method is performed inside the rotating impeller region for several stable and off-design (including surge and near-surge) operating conditions. The acoustic near-field data are presented in terms of noise directivity maps and sound pressure level spectra.For the near-surge condition an amplified broadband feature at two times the frequency of the rotating order of the shaft (possible whoosh noise) was captured. However, an amplified feature around 50% of the rotating order was captured as well. These features are present also during the investigated surge operating conditions, but occur at lower amplitudes as compared with the captured low surge frequency of 43 Hz.

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Section: Introductionmentioning

confidence: 98%

Centrifugal Compressor: The Sound of Surge

Sundström

Semlitsch

Mihăescu

2015

21st AIAA/CEAS Aeroacoustics Conference

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“…Karim et al [9] identified the bad incidence angle that low flow rates present at the leading edge of the compressor blades as the reason of whoosh noise. Large Eddy Simulations were performed in two different operating conditions with 5 different inlet configurations (using swirl vanes, short and large steps and combinations of these elements).…”

Section: Introductionmentioning

confidence: 99%

“…Karim et al [9] and Lee et al [10] combined numerical simulations and experiments to study compressor noise radiation. However, Karim et al only used measurements to confirm the reduction of overall radiated whoosh noise level when increasing the length of the leading edge step.…”

Section: Introductionmentioning

confidence: 99%

Methodology for experimental validation of a CFD model for predicting noise generation in centrifugal compressors

Broatch

Galindo

Garcia

et al. 2014

International Journal of Heat and Fluid Flow

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Centrifugal compressors working in the surge side of the map generate a broadband noise in the range of 1 to 3 kHz, named as whoosh noise. This noise is perceived at strongly downsized engines operating at particular conditions (full load, tip-in and tip-out maneuvers). A 3-dimensional CFD model of a centrifugal compressor is built to analyze fluid phenomena related to whoosh noise. A detached eddy simulation is performed with the compressor operating at the peak pressure point of 160 krpm. A steady flow rig mounted on an anechoic chamber is used to obtain experimental measurements as a means of validation for the numerical model. In-duct pressure signals are obtained in addition to standard averaged global variables. The numerical simulation provides global variables showing excellent agreement with experimental measurements. Pressure spectra comparison is performed to assess noise prediction capability of numerical model. The influence of the type and position of the virtual pressure probes is evaluated. Pressure decomposition is required by the simulations to obtain meaningful spectra. Different techniques for obtaining pressure components are analyzed. At the simulated conditions, a broadband noise in 1-3 kHz frequency band is detected in the experimental measurements. This whoosh noise is also captured by the numerical model.

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“…The bibliographic review shows that whoosh noise is commonly described as a broadband noise either in the 1 kHz-3 kHz band (Gaudé et al, 2008;Lee, Selamet, Kim, Kim, & Kim, 2009;Sevginer, Arslan, Sonmez, & Yilmaz, 2007) or in frequencies ranging from 4 kHz to 12 kHz (Figurella et al, 2012;Karim, Miazgowicz, Lizotte, & Zouani, 2013;Teng & Homco, 2009). Figurella et al (2012) pointed out that the former could be related to Diesel engines whereas the latter correspond to turbochargers installed in gasoline engines.…”

mentioning

confidence: 99%

“…In the literature, approaches to the understanding of the mechanism appear to be either purely experimental (Evans & Ward, 2006;Figurella et al, 2012;Teng & Homco, 2009) or essentially computational (Karim, Miazgowicz, Lizotte, & Zouani, 2013;Lee, Selamet, Kim, Kim, & Kim, 2009). The objective of this paper is to combine both techniques to attain a greater understanding of this particular phenomenon.…”

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confidence: 99%

Simulations and measurements of automotive turbocharger compressor whoosh noise

Broatch

Galindo

Garcia

et al. 2015

Engineering Applications of Computational Fluid Mechanics

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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.

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Computational Aero-Acoustics Simulation of Compressor Whoosh Noise in Automotive Turbochargers

Cited by 34 publications

References 5 publications

Centrifugal Compressor: The Sound of Surge

Centrifugal Compressor: The Sound of Surge

Methodology for experimental validation of a CFD model for predicting noise generation in centrifugal compressors

Simulations and measurements of automotive turbocharger compressor whoosh noise

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