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Aeroacoustic study of a submerged air inlet using an IDDES/FW-H approach and sound source modelling through direct numerical beamforming
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0002-7006-067X
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-0176-5358
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-4103-0129
2016 (English)In: 22nd AIAA/CEAS Aeroacoustics Conference, American Institute of Aeronautics and Astronautics, 2016Conference paper, Published paper (Other academic)
Abstract [en]

The flow-generated sound from an air inlet at a low Mach number is studied using detached eddy simulation and direct numerical beamforming. The flow is solved through RANS and compressible detached eddy simulation for various velocity ratios, defined as the ratio between the flow speed at the duct entrance and in the free stream. Results for the flow show very good agreement with experimental data from the National Advisory Committee for Aeronautics (NACA). Pressure data is extracted at the position of a virtual microphone array inside the simulation domain, outside of the unsteady flow region. The array data is beamformed on a source test grid over the inlet using standard beamforming and Linear Programming deconvolution approaches. As beamforming is performed from simulated data directly in the acoustically resolved domain, the method is referred to as Direct Numerical Beamforming (DNB). The results give information about the location, amplitude and frequency content of the sound sources around the inlet. The resulting incoherent sound sources can be used as a model for the sound radiated from the inlet. Using a simple Green's function, the corresponding far-field spectrum is computed for two velocity ratios, showing a very good agreement with the spectra obtained from a Ffowcs Williams and Hawkings integral.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2016.
Keyword [en]
Acoustic generators, Aeroacoustics, Air intakes, Flow separation, Linear programming, Mach number, Numerical methods, Transients, Velocity, Deconvolution approach, Detached eddy simulations, Far field spectra, Frequency contents, National advisory committee for aeronautics, Simulation domain, Standard beamforming, Virtual microphone, Beamforming
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-195502DOI: 10.2514/6.2016-2838Scopus ID: 2-s2.0-84982893795ISBN: 9781624103865 (print)OAI: oai:DiVA.org:kth-195502DiVA: diva2:1049760
Conference
22nd AIAA/CEAS Aeroacoustics Conference, 2016, 30 May 2016 through 1 June 2016
Note

QC 20161125

Available from: 2016-11-25 Created: 2016-11-03 Last updated: 2017-06-15Bibliographically approved

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Pignier, NicolasO'Reilly, Ciarán J.Boij, Susann
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