Separated flow noise of a flat plate
Abstract
The separated flow behind a flat plate with large attack angles is experimentally investigated. Parameters related to mechanisms of noise generation, sound intensity, spectral density, and fluid-dynamical features are analyzed. Results show that the noise can be attributed to the wall-pressure fluctuations on the plate surface, possibly generated by acoustic dipole sources. It was found that the time derivatives of fluctuating wall surface pressure are well correlated with the associated acoustic pressure. The noise source strength was proportional to the mean-square time-derivative of fluctuating surface pressure and its correlation area. It is concluded that the noise-source strength distributions can predict the associated acoustic intensity.
- Publication:
-
Tokyo University Institute of Space and Aeronautical Science Report
- Pub Date:
- March 1981
- Bibcode:
- 1981TUASR..46..105M
- Keywords:
-
- Aeroacoustics;
- Flat Plates;
- Noise Prediction (Aircraft);
- Separated Flow;
- Sound Intensity;
- Acoustic Properties;
- Angle Of Attack;
- Computational Fluid Dynamics;
- Far Fields;
- Flow Velocity;
- Jet Aircraft Noise;
- Mean Square Values;
- Sound Pressure;
- Wall Pressure;
- Acoustics