Sound generation in centrifugal compressors

Raitor, Till; Neise, W.

doi:10.1016/j.jsv.2008.01.034

Cited by 97 publications

(81 citation statements)

References 10 publications

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“…The phenomenon may be related to the so-called tip clearance noise described by Raitor and Neise (2008), but Galindo et al (2015) found no influence of tip clearance ratio on whoosh noise. Simulations performed by Mendonça et al (2012) predicted a broadband noise at 70% of impeller rotation frequency, which corresponds to the whoosh noise frequency range.…”

Section: Numerical Simulationsmentioning

confidence: 97%

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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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Section: Numerical Simulationsmentioning

confidence: 97%

“…Instrumentation inside the compressor with pressure transducers as performed by Raitor and Neise (2008) was not considered due to the reduced size of the turbocharger compressor studied. A sketch of the compressor piping is shown in Figure 2, including the linear array.…”

Section: Experimental Testsmentioning

confidence: 99%

Simulations and measurements of automotive turbocharger compressor whoosh noise

Broatch

Galindo

Garcia

et al. 2015

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

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“…3. Similar spectral maps were utilized by Raitor and Neise [25] for noise analysis and by Hellmich and Seume in the case of an axial high speed compressor [26]. This work, however, apart from applying the method to a different type of machine with different gauge locations also features by high resolution in the TOA that allows the identification of the moment of the first appearance of non-stable phenomena.…”

Section: The Quasi-dynamic Analysis Conceptmentioning

confidence: 95%

Use of Pressure Spectral Maps for Analysis of Influence of the Plenum Volume on the Surge in Centrifugal Blower

Kabalyk

Liśkiewicz

Horodko

et al. 2014

Volume 2D: Turbomachinery

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*The influence of plenum volume on surge phenomenon in a centrifugal blower was studied by means of quasidynamic analysis. In this procedure, signals were gathered at 5 pressure tappings at 146 different positions of the throttling valve controlling the mass flow rate. Frequency spectra obtained by means of Fourier analysis are combined together in the form of colour maps with frequency as the abscissa and valve position as the ordinate. Such a map provides high-resolution information about spectral structures of pressure signals attained at different mass flow rates. Analysis was conducted at two system configurations characterized by different volumes between the blower and the valve i.e. plenum volume. Research confirmed that in both cases the first disturbances appear in the vicinity of the impeller leading edge in the same position of a throttling valve before the surge. Arising flow structure is characterized by strong and random pressure jumps and does not have any dominating frequency. At further valve closure pressure disturbances propagate towards the volute and at deep surge the strongest peaks are observed at the outlet. The moment of deep surge onset is also independent of the plenum volume, however, a difference is observed in the frequency and amplitude of the main modes. With the higher outlet volume the observed oscillations fit well to the frequency of a Helmholtz resonator while, in the case of the smaller volume, the frequency is higher than the frequency of a corresponding Helmholtz resonator. † ASME member

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“…Raitor and Neise [12] measured aero acoustic performance and investigated the sources and mechanisms of sound generation of the spectral components governing the overall noise level of centrifugal compressors. The sound generation mechanisms of centrifugal compressors are well described for low compressor speeds.…”

Section: Introductionmentioning

confidence: 99%

Aeroacoustic Simulation for NASA CC3 Centrifugal Compressor Operating at off Design Condition

et al. 2016

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Abstract. This paper covers the characterization of the acoustic noise and the unsteady flow field of a high speed centrifugal compressor NASA CC3. In order to accurately predict the noise, all analyses are carried out through the use of Large Eddy Simulation and Ffowcs Williams-Hawkings model for noise prediction. The relative effect of hub cavity on flow characteristics and sound levels is investigated, for a compressor stage with a total pressure ratio equal to 4, working from surge to near choke condition. In comparison with the experimental results from literature, the predicted compressor performance and flow field are predicted well. The hub cavity flow effect on the compressor aeroacoustic generated noise is shown in the paper. The unsteady static pressure and sound pressure levels are compared not only at different location but also for design and off design operating points. The internal flow results inside the hub cavity are presented at surge, design and near choke points. The conclusion is that the cavity effect of the centrifugal compressor cannot be ignored in the numerical prediction of aerodynamic generated noise. The impeller back plate of the rotor experiences a strong pressure fluctuation, which is maxima at the impeller outer radius for all operating point, but higher pressure values at the surge point.

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Sound generation in centrifugal compressors

Cited by 97 publications

References 10 publications

Simulations and measurements of automotive turbocharger compressor whoosh noise

Simulations and measurements of automotive turbocharger compressor whoosh noise

Use of Pressure Spectral Maps for Analysis of Influence of the Plenum Volume on the Surge in Centrifugal Blower

Aeroacoustic Simulation for NASA CC3 Centrifugal Compressor Operating at off Design Condition

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