当前位置: X-MOL 学术Aerosp. Sci. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
On the mechanism of acoustic resonances from a leading-edge slat
Aerospace Science and Technology ( IF 5.6 ) Pub Date : 2021-04-09 , DOI: 10.1016/j.ast.2021.106711
Weipeng Li , Yongheng Guo , Wanglin Liu

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.



中文翻译:

关于前沿板条的声共振机理

进行隐式大涡模拟,以研究在两个不同雷诺数下来自前缘板条的声共振。在板条附近识别出三种类型的声波,但是发现只有一种会被流体声反馈机制放大。利用相位平均流场,我们可以清楚地识别出板条湾中的涡旋结构是在与所观察到的声调相同的频率下形成的。在离散涡旋的形成与低频声波的辐射之间确认了流体声反馈回路。提出并验证了理论模型来预测三个迎角下的低频共振频率。还发现高频声波从机翼尾迹区和主翼的吸入侧发出。

更新日期:2021-04-16
down
wechat
bug