The noise emitted by the interaction of a turbulent jet with an airfoil is considered. The incoming-turbulence noise mechanism is assumed to be the dominant noise source. Amiet's broadband noise theory is combined with a semi-empirical description of the turbulent field. The turbulence characteristics of the transitional shear layer are obtained from particle image velocimetry measurements. The turbulence energy spectra are found to compare well with Liepmann's isotropic model. This model is combined with Amiet's theory to predict the noise that would be emitted by a 1-meter span airfoil uniformly submitted to a turbulence with the same characteristics as found in the jet. The noise generated by turbulent flow around airfoils is an environmental concern in aerospace industry for high-lift devices and in applications such as cooling fans or wind turbines. The process of broadband noise generation by turbulence interacting with a solid surface has been recognized since the early ages of aeroacoustics. One distinguishes three basic mechanisms of broadband noise generation by an airfoil: incoming-turbulence noise, self-noise, and vortex-shedding noise.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Aerodynamic noise generated by an airfoil in a turbulent jet flow


    Additional title:

    Aerodynamisches Geräusch, erzeugt durch einen Tragflügel in einer turbulenten Strahlströmung


    Contributors:


    Publication date :

    2005


    Size :

    8 Seiten, 7 Bilder, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English





    Numerical Prediction of Airfoil Aerodynamic Noise

    Manoha, Eric / Herrero, Catherine / Ben Khelil, Saloua et al. | AIAA | 2002


    PREDICTION OF NOISE FROM TURBULENT FLOW FOR AIRFOIL

    V. T. Kalugin / A. S. Epikhin / S. V. Strijhak | DOAJ | 2016

    Free access