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This is a possible way to reduce the separation noise of an aerofoil by introducing Leading Edge serrations (undulations on the front edge of the aerofoil).
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This page is a summary of: Leading edge serrations for the reduction of aerofoil separation self-noise, June 2017, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2017-4169.
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