Importance of an accurate prediction of shock curvature for high-speed rotor noise
Abstract
The ONERA quadrupolar code is presently used in the frequency domain in order to perform high-speed rotor noise predictions, under various assumed shock geometries. The results thus obtained are compared with experimental data. It appears that the calculation results are highly shock-curvature dependent. High-speed impulsive rotor noise reduction may be achievable through a blade design which bends the shock in the rotation plane rearward.
- Publication:
-
American Helicopter Society Journal
- Pub Date:
- January 1992
- Bibcode:
- 1992AHSJ...37...82P
- Keywords:
-
- Acoustic Measurement;
- Curvature;
- Noise Prediction (Aircraft);
- Rotary Wings;
- Shock Waves;
- Uh-1 Helicopter;
- Geometrical Acoustics;
- Mach Number;
- Acoustics