Simulation of Sound Transmission through Automotive Turbochargers

Veloso, Rafael Benedict; Elnemr, Yasser; Reich, Franz Markus; Allam, Sabry

doi:10.4271/2012-01-1560

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…Region 3 is a high frequency range from 1200 to 1600 Hz; it includes some characteristic peaks of the turbocharger compressor. These peaks are described in Veloso and Elnemr (2012) and it seems that the rotor geometrical variations do not have a considerable influence.…”

Section: Validation Of Tmm Methods At Pulsating Flow Operationsmentioning

confidence: 94%

Experimental investigation of transmission loss in an automotive turbocharger compressor under ideal and real engine operating conditions

Nemr

Veloso

Girstmair

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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Acoustic transmission losses are expected to occur over the turbocharger compressor, especially along its rotating wheel section. Experiments on the acoustic characteristics of automotive turbocharger compressors were performed to investigate this acoustic transmission loss behavior. Two different rotor sizes were acoustically investigated considering approximately the same performance characteristics of the compressors. The investigated variants passed through two phases of measurements: The first phase was performed under ideal operating conditions involving a steady non-pulsating flow on an acoustic component test rig for turbochargers. Whereas the second phase was conducted under real engine operating conditions including pulsating flow of a modern 6-cylinder gasoline engine on an engine test rig. Comparisons between the two measurement phases show a considerable agreement between the two test rig setups for different operating conditions.

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Section: Validation Of Tmm Methods At Pulsating Flow Operationsmentioning

confidence: 94%

Experimental investigation of transmission loss in an automotive turbocharger compressor under ideal and real engine operating conditions

Nemr

Veloso

Girstmair

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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“…However, due to the harsh conditions at compressor outlet (temperature as high as 150°C, oil particulates in the flow, pressure up to 2bar), it is quite difficult to implement a reliable solution with an acoustic source placed on the high pressure side of the compressor. Recent studies [7,8] have implemented such a solution; however they always used compressor drivers which can sustain harsh conditions but are of low precision at low frequencies. It was hence chosen to use the Two-Load technique, which allows us to use only one acoustical source, on the low pressure side.…”

Section: Transfer Matrixesmentioning

confidence: 99%

Determination of the transfer matrix of an automotive compressor under realistic flow conditions

Rousselet

Gibiat

Lefebvre

et al. 2013

The Journal of the Acoustical Society of America

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Determination of the transfer matrix of an automotive compressor under realistic flow conditions Waves propagating into air intake pipes of automotive engines have been widely studied and are commonly used to obtain high volumetric efficiency. Nowadays, most of modern engines have a centrifugal compressor in their intake line. If the acoustic of intakes lines for naturally aspirated engines is well known, it is not the case for lines comprising a compressor, where both the geometry and the flow effects are of primary interest. As it is quite difficult to experimentally determine the acoustical behavior of a complete line comprising a compressor, a new system has been developed for determining acoustical transfer matrixes of each separated element of the line with flow. This new method is based on the two loads method; where a derivative of the Two Measurements Three Calibrations calibration method has been introduced. The basics of the determination of transfer matrixes with flow with our method are presented, then experimental results on cylindrical tubes and parts of intake lines are discussed. Finally an example of a transfer matrix of centrifugal compressor is presented.

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“…---------Sound scattering through small automotive compressors is often computed with low-dimensional (0D, 1D) models [1][2][3]. However, the results of these models are only accurate at very low frequencies below 30% of the first cut-on frequencies and for low rotational speeds.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Scattering Computations for High-Speed Rotors using Rotating Reference Frames

Jacob,

Åbom

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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The rotational effect is a crucial factor that needs to be considered when dealing with acoustic wave scattering through high-speed rotors, e.g., in propulsion line simulations. Neglecting the rotational effect can lead to inaccurate results, especially in scenarios such as computing the transmission loss through compressors. Therefore, it is essential to incorporate the rotational effect in the governing linearized equations for fluid flow. This approach involves utilizing a rotating frame of reference in a stationary geometry, which has been demonstrated to be both straightforward and numerically inexpensive. Overall, the findings of this study highlight the importance of considering rotational effects in acoustic wave scattering simulations, particularly in high-performance turbo-machinery applications.

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Simulation of Sound Transmission through Automotive Turbochargers

Cited by 10 publications

References 10 publications

Experimental investigation of transmission loss in an automotive turbocharger compressor under ideal and real engine operating conditions

Experimental investigation of transmission loss in an automotive turbocharger compressor under ideal and real engine operating conditions

Determination of the transfer matrix of an automotive compressor under realistic flow conditions

Acoustic Scattering Computations for High-Speed Rotors using Rotating Reference Frames

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