Trailing-edge noise is the primary source of airfoil self-noise. Nonflat-plate serrated trailing edge can suppress the broadband trailing-edge noise at high frequencies, while the overall noise reduction is compromised by low-frequency narrowband bluntness-induced noise at the sawtooth root. In this paper, a nonflat-plate transition-serrated trailing edge is proposed to reduce the bluntness-induced noise. The configuration uses a wedge-shaped transition structure within the sawtooth gap to eliminate the bluntness noise. Firstly, the appropriate parameters of the transition structure are determined by numerical simulation. Then, optimal configuration is employed for test verification. Finally, the noise reduction mechanism of the configuration with the best noise reduction is analyzed. Simulation results indicate that the configuration can accelerate the fragmentation of large-scale spanwise vortices at sawtooth root, weakening the vortex shedding noise. Moreover, compared with the nonflat-plate serrated trailing edge, it forms counter-rotating oblique vortices at a position further forward within the sawtooth gap, promoting transverse flow, thereby reducing broadband noise over most frequencies. Experimental results show that the configuration with an appropriate transition structure can afford the highest reduction of 27.2 dB for the bluntness-induced noise and 5.7 dB for the trailing-edge noise.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Nonflat-Plate Transition-Serrated Trailing Edge for Airfoil Self-Noise Reduction


    Contributors:
    Feng, Daofang (author) / Li, Yuanwen (author) / Pan, Wei (author) / Li, Min (author) / Wei, Long (author)

    Published in:

    AIAA Journal ; 60 , 9 ; 5313-5323


    Publication date :

    2022-09-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Self-Noise Produced by an Airfoil with Nonflat Plate Trailing-Edge Serrations

    Chong, Tze Pei / Vathylakis, Alexandros / Joseph, Phillip F. et al. | AIAA | 2013


    Airfoil Self-Noise Reduction Using Fractal-Serrated Trailing Edge

    Hasheminejad, Seyed Mohammad / Chong, Tze Pei / Joseph, Phillip et al. | AIAA | 2018


    Poro-Serrated Trailing-Edge Devices for Airfoil Self-Noise Reduction

    Vathylakis, Alexandros | Online Contents | 2015


    Poro-Serrated Trailing-Edge Devices for Airfoil Self-Noise Reduction

    Vathylakis, Alexandros / Chong, Tze Pei / Joseph, Phillip F. | AIAA | 2015