Lacagnina, Giovanni, Paruchuri, Chaitanya, Berk, Tim, Joseph, Phillip, Kim, Jung-Hoon, Ganapathisubramani, Bharathram, Hasheminejad, Seyed Mohammad, Chong, Tze Pei, Stalnov, Oksana, Choi, Kwing-so, Shahab, Muhammad Farrukh, Omidyeganeh, Mohammad and Pinelli, Alfredo (2019) Mechanisms of airfoil noise near stall conditions. Physical Review Fluids, 4 (12), [123902]. (doi:10.1103/PhysRevFluids.4.123902).
Abstract
The main focus of this paper is on investigating the noise produced by an aerofoil at high angles of attack over a range of Reynolds number 2x10^5-4x10^5. The objective is not modelling 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.
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