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On the mechanism of acoustic resonances from a leading-edge slat

机译：关于前缘板块声谐振的机理

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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. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：进行隐式大涡模拟以研究来自两个不同雷诺数的前缘板块的声学共振。 在板条附近识别三种类型的声波，但仅发现一个通过流体声反馈机制放大一个。 通过相平方的流场，我们清楚地识别在观察到的声音音调的相同频率下形成板湾中的涡流结构。 在形成离散涡流的形成和低频声波的辐射之间确认了流体声反馈回路。 提出和验证了理论模型，以在三个攻击角度预测低频共振的频率。 还发现高频声波从板唤醒区域和主翼的吸入侧散发出来。 （c）2021 Elsevier Masson SAS。 版权所有。

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