Sound radiation of the exhaust gas turbocharger as a function of the compressor inflow

Moritz, Johannes; Becker, Stefan

doi:10.1016/j.jsv.2021.115969

Cited by 5 publications

(2 citation statements)

References 35 publications

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“…20,21 Improving the acoustic characteristic of the scroll compressor is not only the important way to optimize the human living environment, but also the requirement for future development of the compressor. [22][23][24] During the practical application, the authors have found that the check valve structure has the great influence on the noise performance of the refrigerant compressor. Especially at the low (1800 rpm) and medium (4200 rpm) rotation speed, the valve plate noise contributes greatly to the overall sound pressure level.…”

Section: Introductionmentioning

confidence: 99%

Research on the influence of check valve on noise performance of variable frequency scroll refrigeration compressor

Yan

Wang

et al. 2023

International Journal of Aeroacoustics

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Check valve is one of the core components of the scroll refrigeration compressor, which can directly affect its efficiency, life, and noise performance. Traditional check valve is the reed valve. This paper deeply studies the dynamic characteristics of reed valve and reveals the main reason of the valve noise under different rotation speeds. The large noise is mainly attributing to the large pressure pulsation as well as fast circulation velocity of fluid and the severe slapping of the reed plate on the valve seat, which is influenced by the high pressure ratio of the working condition and stiffness of the reed valve. In order to reduce the noise of the check valve, the circular valve is designed to replace reed valve in this paper. At each rotation speed, the circular valve shows a continuous exhaust process, which avoids the slapping of the valve plate on the valve seat. More importantly, the exhaust is smooth and the pressure pulsation as well as the flow rate of the fluid is reduced significantly leading to the low aerodynamic noise. Therefore, compared with the reed valve compressor, the sound pressure level of the circular valve compressor at 1800, 4200, and 6600 rpm is decreased by 3.0, 5.2, and 0.3 dB, respectively.

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Section: Introductionmentioning

confidence: 99%

Research on the influence of check valve on noise performance of variable frequency scroll refrigeration compressor

Yan

Wang

et al. 2023

International Journal of Aeroacoustics

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“…Moritz et al [65] experimentally measured the effect of a 105 • bend upstream of the compressor on performance and radiated noise. The elbow generates the well-known Dean vortices pattern.…”

Section: Impact Of Inlet Duct Geometriesmentioning

confidence: 99%

On the iInfluence of Inlet Geometry on Turbocharger Compressor Noise.

Villanueva¹

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In today's society, there is a growing awareness of the importance of global warming. This concern is reflected by the legislative powers of Western nations in increasingly restrictive emissions regulations. In this context, the automotive industry has been strongly encouraged to develop more efficient thermal engines and even to explore new propulsion solutions, such as the electric motor.The trend adopted to improve the energy efficiency of reciprocating internal combustion engines is the reduction of engine size. This has forced compressors to work in more extreme conditions, where their acoustic emission becomes troublesome. The problem of acoustic response takes on greater relevance in the context of competition against the electric car, which is inherently quieter. Even hybrid vehicles that incorporate downsized thermal engines to power the electric motor batteries have the aforementioned compressor noise problems, which remain a disadvantage compared to fully-electric vehicles. The emergence of new technologies such as drones, whose presence is rapidly increasing in urban and industrial environments, reinforces the interest in methodologies for analyzing the acoustic emissions of turbomachines.The literature review carried out in this thesis shows that in the last two decades, there has been a great boom of research in the acoustics of radial turbocharger compressors. Despite the progress made, there is still no consensus about the cause of specific spectrum components, such as the broadband noises known as whoosh and Tip Clearance Noise (TCN). The influence of compressor inlet duct geometry on noise is also scarcely explored. This thesis presents a computational methodology of flow field analysis that allows the identification of the flow structures responsible for the most relevant spectral components and the analysis of the influence of operating conditions and inlet geometries on them.The pressure field inside the compressor is analyzed through modal decomposition techniques. These allow identifying spatial patterns and associating them to the frequencies of the measured spectrum in an objective manner. Subsequently, the flow structures corresponding to these patterns are identified, and their evolution with the operating conditions and the inlet geometry is analyzed. Through the application of the described methodology, the different mechanisms of generation of the tonal noises in the inducer and the impeller trailing edge are identified. While the former is related to the the cavern of ignorance "until finding the clarity of the sun" that represents scientific knowledge. It is certainly not an easy road, although fortunately, I have not had to travel it alone. In the first place, I owe special thanks to my supervisor, Prof. Broatch, for his support and guidance during the development of this work.Thanks to all my colleagues at the Noise and Thermal Management line, among whom I would like to express my admiration and gratitude to Dr. Jorge García-Tíscar for his always generous collaboration. I would ...

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A DFT Spectrum Acoustic Analysis for Investigating Pulse Duration Effect on Performance, Psychoacoustic Sound Level of Turbocharger Turbines Through C + + FDM Code

Ketata

Driss

2022

Arab J Sci Eng

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Sound radiation of the exhaust gas turbocharger as a function of the compressor inflow

Cited by 5 publications

References 35 publications

Research on the influence of check valve on noise performance of variable frequency scroll refrigeration compressor

Research on the influence of check valve on noise performance of variable frequency scroll refrigeration compressor

On the iInfluence of Inlet Geometry on Turbocharger Compressor Noise.

A DFT Spectrum Acoustic Analysis for Investigating Pulse Duration Effect on Performance, Psychoacoustic Sound Level of Turbocharger Turbines Through C + + FDM Code

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