The prediction of static-to-flight changes in jet noise
Abstract
While the static-to-flight changes in the overall level of the jet noise from single-stream circular nozzles can be predicted simply, the spectral changes are complex. By taking account of the changes in the jet refraction, using geometric acoustics, it is shown that excellent spectral predictions can be obtained. Recent flight-simulation tests covering a wide range of jet conditions have resulted in some new observations related to flight effects and this data has been used to develop a new prediction method.
- Publication:
-
Orbit-Raising and Maneuvering Propulsion: Research Status and Needs
- Pub Date:
- October 1984
- Bibcode:
- 1984aiaa.confY....B
- Keywords:
-
- Jet Aircraft Noise;
- Noise Prediction (Aircraft);
- Nozzle Flow;
- Amplitudes;
- Angular Distribution;
- Geometrical Acoustics;
- Noise Spectra;
- Subsonic Flow;
- Acoustics