This paper compares aeroacoustic methods for the prediction of parallel blade-vortex interaction noise using data from a specialized rotor test. The test, performed in the NASA Ames 80- by 120-Foot Wind Tunnel, involved a small-scale rotor interacting with a vortex generated by a wing mounted upstream. These data were the focus of a working group that compared a wide range of methods for the prediction of BVI noise. The aerodynamic models include computational fluid dynamics, boundary element, and indicial methods. Acoustic methods include Kirchhoff methods and the Ffowcs-Williams Hawkings approach. The comparisons of computed and measured surface pressure data reveal a number of differences, none of which seem to have major acoustic significance. Comparisons of computed and measured far-field pressures show that BVI acoustics is generally well predicted when the blade aerodynamics are well defined, with more variations being found between the Kirchhoff methods. Within the limitations of the present test, this indicates that BVI noise is reasonably well predicted when vortex parameters (location, circulation, and core radius) are accurately known.
Methods for the prediction of blade-vortex interaction noise
Vergleich numerischer Verfahren zur Vorhersage der Schallabstrahlung infolge der Wechselwirkung der Rotorblätter mit Wirbeln mit Versuchsergebnissen
Journal of the American Helicopter Society ; 45 , 4 ; 303-317
2000
15 Seiten, 30 Bilder, 2 Tabellen, 29 Quellen
Article (Journal)
English
Rotor (Drehflügel) , Hubschrauber , Wirbelröhre , Wechselwirkung , Flügelblatt , Windkanal , Schallabstrahlung , mathematisches Modell , Validierung , numerische Strömungssimulation , numerisches Verfahren , Theorie-Experiment-Vergleich , Methodenvergleich , Versuchsaufbau , experimentelle Untersuchung , Druckverteilung , Schallpegel
Technical Note - Methods for the Prediction of Blade-Vortex Interaction Noise
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