Euler/Kirchhoff methods have been developed at ONERA and DLR to predict the HSI noise (High Speed Impulsive) generated by helicopter rotors in hover or in forward flight. The main purpose of this common work is to validate and to compare aeroacoustic computations on delocalized test cases. Code to code comparisons show rather close aerodynamic and acoustic predictions. Acoustic results are identical when using the same aerodynamic inputs. In hover, both aerodynamic and acoustic results obtained by each partner are in good agreement with experiment. In forward flight, a first set of computations relative to a non-rectangular blade rotor model is performed using three different sized grids. Correlation of blade pressure coefficients improve experiment when the grid is refined. However, the capture of the shock waves beyond the blade is not accurate enough to get reasonable noise predictions with respect to the Kirchhoff surface location, whatever the grid refinement may be. In order to improve the aeroacoustic computations in the far-field, an 'adapted' grid has been generated. Acoustic predictions are clearly improved, showing the requirement for a grid adaptation to perform accurate HSI noise predictions on advanced blade geometries.


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    Title :

    Helicopter rotor noise prediction using ONERA and DLR Euler/Kirchhoff methods


    Additional title:

    Hubschrauberrotorlärmvorhersagen mit ONERA- und DLR-Euler/Kirchhoff-Methoden


    Contributors:
    Polacsek, C. (author) / Zibi, J. (author) / Rouzaud, O. (author) / Kuntz, M. (author)

    Published in:

    Publication date :

    1999


    Size :

    11 Seiten, 21 Bilder, 3 Tabellen, 23 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Predictions of High Speed Impulsive Noise Using ONERA and NAL Euler/Kirchhoff Methods

    Zibi, J. / Polacsek, C. / Rouzaud, O. et al. | British Library Conference Proceedings | 1998


    Helicopter Noise Predictions Using Kirchhoff Methods

    Strawn, R. C. / Biswas, R. / Lyrintzis, A. S. et al. | British Library Conference Proceedings | 1995


    Kirchhoff Methods for Rotor Noise Prediction

    Lee, S. / Japan Aeronautical Engineers Association | British Library Conference Proceedings | 1995


    Kirchhoff methods for rotor noise prediction

    Lee, S. / Japan Society for Aeronautical and Space Sciences | British Library Conference Proceedings | 1995