Rotorcraft Impulsive (i.e. High-Speed Impulsive (HSI) and Blade-Vortex Interaction (BVI)) noise for advancing rotors is studied numerically. The unsteady transsonic Full-Potential Rotor (FPR or FPRBVI) code is used for the simulation of the near-field flow. A rotating Kirchhoff's method has been installed in the TRAC (TiltRotor Aeroacoustic Codes) system of NASA Langley and is used for the extension to the acoustic far-field. The results are compared to available experiments and results from the acoustic analogy code WOPWOP. Results for both HSI and BVI (including both independently-generated and self-generated vortices) are presented and compared with several experiments. The results show that the rotating Kirchoff noise method is becoming a very valuable tool for rotorcraft impulsive noise prediction and can complement codes based on the acoustic analogy method.
An evaluation of a rotating Kirchhoff acoustic methodology
Journal of the American Helicopter Society ; 43 , 1 ; 57-65
1998
9 Seiten, 19 Bilder, 31 Quellen
Article (Journal)
English
ACOUSTIC RADIATION FROM ROTATING BLADES-THE KIRCHHOFF METHOD IN AEROACOUSTICS
Online Contents | 2001
|An Evaluation of a Rotating Kirchoff Acoustic Methodology
Online Contents | 1998
|Rotorcraft Impulsive Noise Prediction Using a Rotating Kirchhoff Formulation
Online Contents | 1996
|