Three-Dimensional (3-D) transonic Blade-Vortex-Interaction (BVI) noise for an advancing rotor is studied numerically. The unsteady transonic Full-Potential Rotor (FPR) code is used for the simulation of the transonic BVI near-field flow. A rotating Kirchhoff's method is used for the extension to the acoustic far-field. The formulation (Farassat's method) is extended for an advancing rotor and an observer moving with the free stream allows a direct comparison with experiments. Test results are presented in this paper for a rotating point source. Results for transonic advancing BVI are presented and various cases are shown. The understanding of the 3-D transonic BVI noise mechanisms and directivity for an advancing rotor are discussed here.
Transonic 3-D BVI noise using a rotating Kirchhoff formulation for advancing rotors
Die rechnerische Erfassung der schallnahen Wechselwirkung von Rotorblatt und Wirbelbildung und deren Geräuschemission für verbesserte Rotorblätter
Forum, Annual Forum, American Helicopter Society, 50 ; 1 ; 115-127
1994
13 Seiten, 10 Bilder, 44 Quellen
Conference paper
English
Transonic Noise Prediction of Rotating Blades by Means of the Kirchhoff Formulation
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