The effectiveness of the Helmholtz resonator as a narrow band acoustic attenuator, particularly at low frequencies, makes it a highly desirable component in a wide variety of applications, including engine breathing systems. The present study investigates the influence of mean flow grazing over the neck of such a configuration on its acoustic performance both computationally and experimentally. Three-dimensional unsteady, turbulent, and compressible Navier-Stokes equations are solved by using the Pressure-Implicit-Splitting-of-Operators algorithm in STAR-CD to determine the time-dependent flow field. The introduction of mean flow in the main duct is shown to reduce the peak transmission loss and shift the fundamental resonance frequency to a higher value. The predictions for transmission loss exhibit a good agreement with the experimental results obtained on a flow-impedance tube, thereby demonstrating the effectiveness of the computational approach in studying the complex interactions of the flow field with the acoustics of Helmholtz resonators.


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    Title :

    Effect of Flow on Helmholtz Resonator Acoustics: A Three-Dimensional Computational Study vs. Experiments


    Additional title:

    Sae Technical Papers


    Contributors:
    Selamet, Ahmet (author) / Iqbal, Asim (author) / Selamet, Emel (author) / Kim, Hyunsu (author)

    Conference:

    SAE 2011 Noise and Vibration Conference and Exhibition ; 2011



    Publication date :

    2011-05-17




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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