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Mechanisms of airfoil noise near stall conditions
University of Southampton.ORCID iD: 0000-0002-8038-1127
University of Southampton.
University of Southampton.
University of Nottingham.
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2019 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 4, no 12Article in journal (Refereed) Published
Abstract [en]

The focus of this paper is on investigating the noise produced by an airfoil at high angles of attack over a range of Reynolds number Re≈ 2× 10^5 – 4× 10^5. The objective is not modeling this source of noise but rather understanding the mechanisms of generation for surface pressure fluctuations, due to a separated boundary layer, that are then scattered by the trailing edge. To this aim, we use simultaneous noise and surface pressure measurement in addition to velocimetric measurements by means of hot wire anemometry and time-resolved particle image velocimetry. Three possible mechanisms for the so-called “separation-stall noise” have been identified in addition to a clear link between far-field noise, surface pressure, and velocity fields in the noise generation.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2019. Vol. 4, no 12
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-272748DOI: 10.1103/PhysRevFluids.4.123902ISI: 000501525100002Scopus ID: 2-s2.0-85087886497OAI: oai:DiVA.org:kth-272748DiVA, id: diva2:1427038
Note

QC 20200602

Available from: 2020-04-28 Created: 2020-04-28 Last updated: 2024-02-21Bibliographically approved

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Lacagnina, Giovanni

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