On the mechanism of acoustic resonances from a leading-edge slat
| Autor: | Weipeng Li, Yongheng Guo, Wanglin Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
0209 industrial biotechnology Leading edge Wing Suction Acoustics Aerospace Engineering Reynolds number 02 engineering and technology Acoustic wave Feedback loop 01 natural sciences 010305 fluids & plasmas Vortex Physics::Fluid Dynamics Mechanism (engineering) symbols.namesake 020901 industrial engineering & automation Computer Science::Sound 0103 physical sciences symbols |
| Zdroj: | Aerospace Science and Technology. 113:106711 |
| ISSN: | 1270-9638 |
| DOI: | 10.1016/j.ast.2021.106711 |
| Popis: | Implicit large-eddy simulations are performed to investigate the acoustic resonances from a leading-edge slat at two different Reynolds numbers. Three types of acoustic waves are identified in the vicinity of the slat, but only one is found to be amplified by fluid-acoustic feedback mechanism. With phase-averaged flow-fields, we clearly identify that the vortical structures in the slat cove are formed at the same frequencies of the observed acoustic tones. A fluid-acoustic feedback loop is confirmed between the formation of the discrete vortices and the radiation of low-frequency acoustic waves. A theoretical model is proposed and validated to predict the frequencies of low-frequency resonances at three angles of attack. High-frequency acoustic waves are also found to emanate from the slat-wake region and the suction side of the main wing. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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