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Measurement of Sound Power Due to Flow Noise at the Outlet of a Straight Pipe
Technical Paper
2021-01-1050
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Intake, exhaust, and heating / air conditioning systems in automobiles consist of various common duct elements. Noise arises primarily due to the source and is attenuated using common elements like expansion chambers and resonators. This attenuation is straightforward to predict using plane wave simulation and more advanced numerical methods. However, flow noise is often an unexpected important noise source. Predictions require computer intensive analyses. To better understand the aeroacoustic sources in duct systems, a flow rig has been developed at the University of Kentucky. The flow rig consists of a blower, a silencer to attenuate blower noise, external noise sources, and then the test duct. The flow rig can be equipped with an anechoic termination to measure transmission loss or may be used to measure insertion loss directly. In the latter case, the sound power is measured from the pipe outlet inside of a hemi-anechoic chamber. In this research, the external noise sources are excluded, and the flow noise is measured directly. An experimental investigation is performed to determine the sound power for a range of different duct lengths, diameters, and flow rates. Sound pressure level results are reported versus frequency and versus the Strouhal number. The objective of this work is to provide data for validating future computational fluid dynamics predictions and to provide engineers with some expectation of the anticipated flow noise for common situation.
Citation
Donkin, S. and Herrin, D., "Measurement of Sound Power Due to Flow Noise at the Outlet of a Straight Pipe," SAE Technical Paper 2021-01-1050, 2021, https://doi.org/10.4271/2021-01-1050.Data Sets - Support Documents
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References
- Chen , J. 2019
- Elnady , T. A Platform to Measure Transmission Loss of Mufflers with Flow INTER-NOISE Conference Proceedings 2007
- Davies , H.G. and Ffowcs Williams , J.E. Aerodynamic Sound Generation in a Pipe Journal of Fluid Mechanics 4 June 1968 765 778 https://doi.org/10.1017/s0022112068001011
- Kuhn , G.F. and Morfey , C.L. Noise Due to Fully Developed Turbulent Flow Exhausting from Straight and Bent Pipes Journal of Sound and Vibration 1 January 1976 27 35 https://doi.org/10.1016/0022-460x(76)90704-5
- SIDLAB 4.2.1 2018
- VDI 3733 1996
- Ducret , F. 2006
- Davies , P.O.A.L. , Bento Coelho , J.L. , and Bhattacharya , M. Reflection Coefficients for an Unflanged Pipe with Flow Journal of Sound and Vibration 4 October 1980 543 546 https://doi.org/10.1016/0022-460x(80)90364-8