Abstract
Bio-inspired noise reduction based on the silent flight characteristics of the owl is an effective passive aerodynamic noise control method. Inspired by the silent flight of owls, this paper investigates trailing edge noise control of the NACA 0012 airfoil by using a brush-serrated coupling bionic structure at chord based Reynolds numbers ranging from Rec=6×105 to Rec=1.2×106. Preliminary experimental results showed that the proposed brush-serrated coupling bionic structure can not only avoid low-frequency vortex shedding tonal noise caused by single serrated trailing edges, but also reduce noise emission in a wider frequency range, which can be widely used in aerodynamic noise control.
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