Open AccessReduction of Trailing-Edge Noise by Means of Brush-Serrated Coupling Bionic Structure
Author(s) -
Yong Wang,
Yingying Zhao,
Hao Tian,
Kun Zhao,
Yubao Song
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/538/1/012053
Subject(s) - airfoil , trailing edge , chord (peer to peer) , noise (video) , brush , noise reduction , noise control , acoustics , aerodynamics , coupling (piping) , materials science , physics , engineering , computer science , aerospace engineering , structural engineering , mechanical engineering , artificial intelligence , distributed computing , image (mathematics)
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 Re c =6×10 5 to Re c =1.2×10 6 . 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.