A low-cost CAA (Computational Aeroacoustics) method has been applied to make slat noise predictions with an computational effort in the range acceptable for a design tool. The turbulence related slat-noise sources are modeled with a random particle mesh (RPM) method, which matches the statistical features of a steady RANS (Reynolds Averaged Navier-Stokes equation) target solution quite closely. A modified two-element airfoil, consisting of a slat and a main element, is used for the slat noise predictions. The slat noise directivity found from the computations roughly corresponds to that of a dipole located at the slat trailing edge with its axis normal to the slat chord. The characteristics of narrow as well as 1/3-octave spectra agree with those found from measurements. The slat noise is found to scale with the 4.3 power of the Mach number. The effect of a slat cove cover was furthermore investigated. Reductions around 5dB in a range up to 8kHz (based on 0.4m clean chord length) are found in the narrow band spectra, clearly indicating a potential of slat cove fillers to reduce sound levels.


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    Title :

    Slat noise predictions based on APE and stochastic sound sources from RANS


    Additional title:

    Vorhersage des Vorflügelgeräusches auf der Grundlage der akustischen Störungsgleichungen und stochastischer Schallquellen aus den Reynolds-gemittelten Navier-Stokes-Gleichungen


    Contributors:
    Ewert, R. (author) / Münsch, M. (author)


    Publication date :

    2006


    Size :

    10 Seiten, 12 Bilder, 18 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    SLAT NOISE PREDICTIONS BASED ON APE AND STOCHASTIC SOUND SOURCES FROM RANS

    Ewert, R. / Munsch, M. / International Council of the Aeronautical Sciences | British Library Conference Proceedings | 2006



    Prediction of Slat Broadband Noise with RANS Results

    Bai, Baohong / Li, Xiaodong / Guo, Yueping et al. | AIAA | 2015