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Experimental/numerical study of ducted-fan noise: Effect of duct inlet shape
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2018 (English)In: AIAA Journal, ISSN 0001-1452, E-ISSN 1533-385X, Vol. 56, no 3, p. 979-996Article in journal (Refereed) Published
Abstract [en]

The paper presents an investigation of flow and noise produced by the generic fan of an environmental control system installed in a circular duct, with a focus on the evaluation of the effect of mean flow distortions and elevated turbulence levels upstream of the fan, which are here created by replacing a baseline smooth bell-mouth duct inlet by inlets with a rectangular-to-circular transition of the duct cross section and with a T junction formed by two circular pipes. The study includes both experiments, which are aimed primarily at supplying data for a validation of simulation approaches and numerical simulations based on a hybrid Reynolds-averaged Navier-Stokes/large-eddy simulation approach. An acoustic modal decomposition of the measured and computed unsteady pressure fields is then carried out, which allows extracting "pure" (with filtered out hydrodynamic/turbulent fluctuations) acoustic modes propagating upstream and downstream under reflection-free conditions. A comparison with the experiment is performed for both the "raw" pressure spectra on the duct walls and the extracted individual acoustic modes. It is shown that, in terms of acoustics, a replacement of the clean inlet by the rectangular/circular one is almost neutral, whereas the T-junction inlet causes a strong noise penalty.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2018. Vol. 56, no 3, p. 979-996
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-224591DOI: 10.2514/1.J055870Scopus ID: 2-s2.0-85043279301OAI: oai:DiVA.org:kth-224591DiVA, id: diva2:1192017
Funder
EU, FP7, Seventh Framework Programme, Integrated Design of Optimal Ventilation Systems for Low Cabin and Ramp Noise (grant agreement 314066)
Note

QC 20180321

Available from: 2018-03-21 Created: 2018-03-21 Last updated: 2018-03-21Bibliographically approved

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Sack, Stefan

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