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Installation Effects on the Flow Generated Noise from Automotive Electrical Cooling Fans
Technical Paper
2020-01-1516
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
With the electrification of road vehicles comes new demands on the cooling system. Not the least when it comes to noise. Less masking from the driveline and new features, as for example, cooling when charging the batteries drives the need for silent cooling fans. In this work a cluster installation of electrical fans is studied in different generalized installations and operating conditions. The fans are installed in a test rig where the operation could be controlled varying the speed, flow rate and pressure rise over the fan. On the vehicle side of the fan a generalized packaging space (similar to an engine bay for conventional vehicles) is placed. In this packaging space different obstruction can be placed to simulate the components and radiators used in the vehicle. Here generalized simple blocks in different configuration are used to provide well defined and distinct test cases. Of special interest are cases with poor inlet flow profile and the influence of this on the sound generation. Noise results are compared to scaling laws for the influence of fan speed, efficiency and clustering. It is shown that the fans are not so sensitive to the downstream installation as long as they are not run in an extreme end of the efficiency curve. For engineering use a scaling law with relative fan speed is sufficient. More unexpected results are seen when clustering the fans. The cluster makes more noise than the individual fans suggest. It was also found that deactivating two of the four fans actually increases the noise in the tested installation. These clustering effects are believed to be due to non-uniform inlet flow with increased turbulence levels.
Citation
Karlsson, M. and Etemad, S., "Installation Effects on the Flow Generated Noise from Automotive Electrical Cooling Fans," SAE Technical Paper 2020-01-1516, 2020, https://doi.org/10.4271/2020-01-1516.Also In
References
- Ffowcs Williams , J.E. , and Hawkings , D.L. Sound Generation by Turbulence and Surfaces in Arbitrary Motion Phil. Trans. Royal Society of London, Series A264 321 342 1962
- Lighthill , M.J. On Sound Generated Aerodynamically II Proceedings of the Royal Society of London, Series A222 1 32 1954
- Neise , W. and Michel , U. 1994
- Blake , W.K. Mechanics of Flow-Induced Sound and Vibration Second Edition Academic Press 2017
- Morfey , C.L. Rotating Blades and Aerodynamic Sound Journal of Sound and Vibration 28 3 587 617 1973
- Krömer , F.J. 2017
- Alexander , W.N. , Devenport , W.J. , and Glegg , S.A.I. Noise from a Rotor Ingesting a Thick Boundary Layer and Relation to Measurements of Ingested Turbulence Journal of Sound and Vibration 409 227 240 2017
- Hanson , D.B. Spectrum of Rotor Noise Caused by Atmospheric Turbulence Journal of the Acoustical Society of America 56 110 1974
- Wojno , J.P. , Mueller , T.J. , and Blake , W.K. Turbulence Ingestions Noise, Part 2: Rotor Aeroacoustic Response to Grid-Generated Turbulence AIAA Journal 40 1 2002
- Moreau , S. , and Sanjose , M. Sub-Harmonic Broadband Humps and Tip Noise in Low-Speed Ring Fans The Journal of the Acoustical Society of America 139 118 2016
- Rynell , A. , Efraimsson , G. , Chevalier , M. , and Åbom , M. A Numerical Study of Noise Characteristics Originating from a Shrouded Subsonic Automotive Fan Applied Acoustics 140 110 121 2018
- Canepa , E. , Cattanei , A. , and Mazzocut Cecchin , F. Installation Effects on the Tonal Noise Generation by Axial Flow Fans Journal of Sound and Vibration 340 2015
- Christophe , J. , Kucukcoskun , K. , Schram , C. , and Hallez , R. Tonal and Broadband Sound Production of a Locomotive Cooling Unit 19th AIAA/CEAS Aeroacoustics Conference Berlin, Germany 2013
- Etemad , S. and Gullberg , P.V. Validation of URANS Simulation of Truck Cooling fan Performance IMECE 2014, ASME. International Mechanical Engineering Congress & Exposition Montreal, Quebec, Canada 2014
- Gullberg , P.V. 2011
- Zenger , F. , Junger , C. , Kaltenbacher , M. , and Becker , S. A Benchmark Case for Aerodynamics and Aeroacoustics of a Low Pressure Axial fan SAE Technical Paper 2016-01-1805 . 2016 https://doi.org/10.4271/2016-01-1805
- Rynell , A. , Efraimsson , G. , Chevalier , M. , and Åbom , M. Acoustic Characteristics of a Heavy Duty Vehicle Cooling Module Applied Acoustics 111 67 76 2016
- Weidemann , J. 1971 798