Reduction of Trailing-Edge Noise by Means of Brush-Serrated Coupling Bionic Structure

4th International Conference on Manufacturing, Material and Metallurgical Engineering

Wang, Yong^1 ; Zhao, Yu^1 ; Tian, Hao^1 ; Zhao, Kun^1 ; Song, Yu-Bao^1

Key Laboratory of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang

621000, China^1

关键词: Aerodynamic noise;    Bionic structures;    Chord-based Reynolds number;    Frequency ranges;    Noise emissions;    Serrated coupling;    Serrated trailing edges;    Trailing edge noise;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/538/1/012053/pdf
DOI  :  10.1088/1757-899X/538/1/012053

来源: IOP

【 摘 要 】

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.