Mechanisms of airfoil noise near stall conditions

Lacagnina, Giovanni; Chaitanya, Paruchuri; Berk, Tim; Kim, Jung-Hoon; Joseph, Phillip; Ganapathisubramani, Bharathram; Hasheminejad, Seyed Mohammad; Chong, Tze Pei; Stalnov, Oksana; Choi, Kwing-So; Shahab, Muhammad Farrukh; Omidyeganeh, Mohammad; Pinelli, Alfredo

Abstract

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≈2×105–4×105. 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.

Citation

Lacagnina, G., Chaitanya, P., Berk, T., Kim, J., Joseph, P., Ganapathisubramani, B., …Pinelli, A. (2019). Mechanisms of airfoil noise near stall conditions. Physical Review Fluids, 4(12), Article 123902. https://doi.org/10.1103/physrevfluids.4.123902

• Journal Article Type: Article
• Acceptance Date: Oct 23, 2019
• Online Publication Date: Dec 6, 2019
• Publication Date: 2019-12
• Deposit Date: Nov 18, 2020
• Publicly Available Date: Nov 18, 2020
• Journal: Physical Review Fluids
• Electronic ISSN: 2469-990X
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 4
• Issue: 12
• Article Number: 123902
• DOI: https://doi.org/10.1103/physrevfluids.4.123902
• Public URL: https://nottingham-repository.worktribe.com/output/5052422
• Publisher URL: https://journals.aps.org/prfluids/abstract/10.1103/PhysRevFluids.4.123902
• Additional Information: ©2019 American Physical Society