Three-dimensional transonic blade-vortex interaction (BVI) noise is studied numerically. The unsteady transonic-full-potential rotor (FPR) code is used for the simulation of the transonic BVI near-field flow. The rotating Kirchhoff method is used for the extension to the acoustic far field. Two rotating Kirchhoff formulations are developed for the three-dimensional BVI far-field noise prediction. The first formulation (Morino's method) is for an observer rotating with the blade. This allows the direct comparison with computational fluid dynamics results. The second formulation (Farassat's method) is for a stationary observer and allows a direct comparison with acoustic experiments. Test results are presented in this paper for a rotating point source and a transonic high-speed impulsive (HSI) noise prediction. The results for a parallel vortex line interacting with a nonlifting hovering rotor are presented and various cases are shown. The understanding of the three-dimensional transonic BVI noise mechanisms and directivity are discussed here.
Rotating Kirchhoff method for three-dimensional transonic blade-vortex interaction hover noise
Anwendung der rotierenden Kirchhoff-Methode zur Prognose des durch die Wechselwirkungen eines transsonischen Rotorblatts mit dreidimensionalen Wirbeln entstandenen Lärms beim Schweben
AIAA Journal ; 32 , 7 ; 1350-1359
1994
10 Seiten, 13 Bilder, 35 Quellen
Article (Journal)
English
Rotating Kirchhoff Method for Three-Dimensional Transonic Blade-Vortex Interaction Hover Noise
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