An experimental investigation of the trailing edge noise mechanism
Abstract
An experimental investigation has been conducted to understand the physical mechanism of noise generation from a turbulent wall jet discharging over a flat plate and interacting with its sharp trailing edge. An aspect ratio 10 rectangular nozzle was used to provide the wall jet. Measurements made consist of farfield noise, surface pressure fluctuations, turbulent velocity fluctuations, and two-point space-time cross-correlations among these quantities. Results are presented which suggest strongly that the generation mechanism is the interaction of the convecting large scale quasi-orderly disturbance in the upper free shear layer of the wall jet with the trailing edge. The interaction also excites large scale strong vortical motion in the trailing edge wake. The dominant part of the sound field is highly coherent and in phase opposition across the trailing edge.
- Publication:
-
American Institute of Aeronautics and Astronautics Conference
- Pub Date:
- October 1977
- Bibcode:
- 1977aiaa.confQ....Y
- Keywords:
-
- Jet Aircraft Noise;
- Noise Generators;
- Noise Measurement;
- Trailing Edges;
- Turbulent Jets;
- Wall Jets;
- Aircraft Wakes;
- Cross Correlation;
- Far Fields;
- Flat Plates;
- Shear Layers;
- Vortices;
- Acoustics