Flow-field and Noise Characterization of a Controlled-Diffusion Airfoil subject to flow separation and stall

S.K. Kalyani, Stéphane Moreau, D. Ragni

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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The present experimental investigation in the anechoic wind tunnel of university of Sherbrooke focuses on the flow-field and noise characterization of a Controlled Diffusion (CD) airfoil, with the flow transitioning from an attached boundary layer at 15◦ incidence to a completely detached one (deep stall) at 22◦ incidence. Simultaneous unsteady wall-pressure and far-field measurements are performed to investigate the effect of Reynolds number on the separation and stalling noise signature of the CD airfoil. Spanwise coherence exhibits a bi-modal shape with levels of coherence shifting towards lower frequencies and increasing in value with increasing incidences. Spanwise wall-pressure correlation length estimated using Corcos model is found to be approximately 12 mm at 40 m/s and 5 mm at 16 m/s at stalling conditions. Far-field noise scales well with Strouhal number based on chord and U5, indicating a compact dipolar scaling for separation and stall noise mechanisms.
Original languageEnglish
Title of host publication28th AIAA/CEAS Aeroacoustics 2022 Conference
Number of pages11
ISBN (Electronic)978-1-62410-664-4
Publication statusPublished - 2022
Event28th AIAA/CEAS Aeroacoustics 2022 Conference - Southampton, United Kingdom
Duration: 14 Jun 202217 Jun 2022
Conference number: 28

Publication series

Name28th AIAA/CEAS Aeroacoustics Conference, 2022


Conference28th AIAA/CEAS Aeroacoustics 2022 Conference
Country/TerritoryUnited Kingdom

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