Abstract
The suppresion of aerodynamic noise in open cavities is an important problem in aeronautical applications. The acoustic field of a standard cavity model was simulated by using the non-linear disturbance equations and synthetic reconstruction of turbulence based on the RANS equation. The reliability of the method was validated by comparing its result with the experimental data. Based on this, the impact of passive control measures of baffles on cavity turbulent kinetic energy, velocity profile, sound source distribution, pulsating pressure distribution and spectrum characters were analyzed. The analysis indicates that, the strength of the sound source cannot be reduced only by altering the direction or intensity of the shear layer. In order to reduce the flow oscillation effect, the maintaining of the stability of shear layer is also required to influence the distribution and strength of turbulent kinetic energy and sound source. The results show that the passive control measures can effectively decrease the cavity aerodynamic noise.
| Original language | English |
|---|---|
| Pages (from-to) | 156-164 |
| Number of pages | 9 |
| Journal | Zhendong yu Chongji/Journal of Vibration and Shock |
| Volume | 34 |
| Issue number | 1 |
| DOIs | |
| State | Published - 15 Jan 2015 |
Keywords
- Aeroacoustics
- Computer geometry
- Computer simulation
- Experiments
- Non-linear disturbance equations
- Shear layer
- Synthetic reconstruction of turbulence