This paper represents the results of an experimental study aimed at reducing the airfoil self-noise by the trailing-edge serration of four different sawtooth geometries (defined in the serration angle and length). These serrations have a common feature: all of the sawtooth patterns are cut directly into the trailing edge of a realistic airfoil. This configuration offers better structural strength and integrity. For the sawtooth trailing edges investigated here, the radiation of the extraneous vortex shedding noise in a narrowband frequency due to the partial bluntness at the serration roots is unavoidable. However, this narrowband component tends to be less significant provided that the serration angle is large and the serration length is moderate. Sound power was measured, and some of the sawtooth geometries have been shown to afford significant boundary-layer instability tonal noise and moderate turbulent broadband noise reductions across a fairly large velocity range. This paper demonstrates that a nonflat plate serrated trailing edge can also be effective in the self-noise reduction. Some experimental results are also presented in order to explain the self-noise mechanisms.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

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


    Contributors:

    Published in:

    AIAA Journal ; 51 , 11 ; 2665-2677


    Publication date :

    2013-09-20


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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

    Feng, Daofang / Li, Yuanwen / Pan, Wei et al. | AIAA | 2022


    Numerical Study of Self-Noise Produced by an Airfoil with Trailing-Edge Serrations

    Arina, Renzo / Della Ratta Rinaldi, Roberto / Iob, Andrea et al. | AIAA | 2012


    An Experimental Study of Airfoil Instability Noise with Trailing Edge Serrations

    Chong, Tze Pei / Joseph, Phillip / Gruber, Mathieu | AIAA | 2010