Near-field aeroacoustic characteristics of a stalled NACA 0012 aerofoil

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Abstract

Stall and separation noise can be major contributors to the noise emission of rotating blades, such as wind turbines, propellers and fans among others. Hence, this paper experimentally investigates the effects a separated boundary layer has on near-field flow structures, on turbulent surface pressure fluctuation statistics, and therefore on noise radiation. Static pressure distributions and boundary layer profiles are presented to characterize the present flow fields pre- and post-stall. Large surface pressure fluctuation spectra increases have been measured, and surface pressure fluctuation autocorrelation width increases by one order of magnitude during stall have been established. Additionally, highly coherent spanwise structures have been shown to influence the hydrodynamic field and changes in the convection velocity have been assessed for separated boundary layers.
Original languageEnglish
Title of host publicationProceedings of the 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019
EditorsMartin Ochmann
PublisherDEGA e.V.
Pages5421-5428
Number of pages8
ISBN (Print)9783939296157
Publication statusPublished - 9 Sep 2019
Event23rd International Congress on Acoustics - Eurogress Aachen, Aachen, Germany
Duration: 9 Sep 201913 Sep 2019
http://www.ica2019.org/

Publication series

NameProceedings of the ICA AND EAA EUROREGIO
PublisherDEGA e.V.
ISSN (Print)2226-7808

Conference

Conference23rd International Congress on Acoustics
Abbreviated titleICA 2019
CountryGermany
CityAachen
Period9/09/1913/09/19
Internet address

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