Jet noise - Age 25
Abstract
The paper gives a discussion of the three basic types of noise sources, namely, the monopole, dipole, and quadrupole, and their corresponding noise generation theories - the dilational theory, vortex theory, and the quadrupole theory. This serves as a basis for examining the theory of noise in real jets in which account is taken of the effects of convection and refraction. The U to the 8th power law of total jet noise is studied and its accuracy evaluated. Large-scale eddy motions in jets and the production of edge tones are discussed.
- Publication:
-
Inter-noise 75; Proceedings of the International Conference on Noise Control Engineering
- Pub Date:
- 1975
- Bibcode:
- 1975nce..conf...33P
- Keywords:
-
- Aerodynamic Noise;
- Jet Aircraft Noise;
- Noise Generators;
- Noise Intensity;
- Acoustic Measurement;
- Boundary Layer Separation;
- Dilatational Waves;
- Doppler Effect;
- Free Flow;
- Quadrupoles;
- Separated Flow;
- Shear Layers;
- Subsonic Speed;
- Vortices;
- Acoustics