Lacagnina, Giovanni, Paruchuri, Chaitanya, Kim, Jung-Hoon, Berk, Tim, Joseph, Phillip, Choi, Kwing-So, Ganapathisubramani, Bharathram, Hasheminejad, Seyed Mohammad, Chong, Tze Pei, Stalnov, Oksana, Shahab, Muhammad Farrukh, Omidyeganeh, Mohammad and Pinelli, Alfredo (2021) Leading edge serrations for the reduction of aerofoil self-noise at low angle of attack, pre-stall and post-stall conditions. International Journal of Aeroacoustics, 20 (1-2), 130-156. (doi:10.1177/1475472X20978379).
Abstract
This paper addresses the usefulness of leading edge serrations for reducing
aerofoil self-noise over a wide range of angles of attack. Different serration
geometries are studied over a range of Reynolds number (Re =2e5-4e5).
Design guidelines are proposed that permit noise reductions over most angles
of attack. It is shown that serration geometries reduces the noise but adversely
effect the aerodynamic performance suggesting that a trade-off should be sought
between these two considerations. The self-noise performance of leading edge
serrations has been shown to fall into three angle of attack (AoA) regimes: low
angles where the flow is mostly attached, moderate angles where the flow is
partially to fully separated, and high angles of attack where the flow is fully
separated. Leading edge serrations have been demonstrated to be effective in
reducing noise at low and high angles of attack but ineffective at moderate angles.
The noise reduction mechanisms are explored in each of three angle regimes.
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