Influence of the cavity flexible bottom wall on the self-sustaining oscillation mode

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-06-17 DOI:10.1016/j.apacoust.2025.110873

Yuan Liu , Peiqing Liu , Hao Guo , Qiulin Qu , Tianxiang Hu , Yifeng Sun , Shujie Jiang

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引用次数: 0

Abstract

Fluid-structure interaction in a cavity affects self-sustained oscillatory flow and noise. The noise and flow field characteristics of cavities with different flexible bottom walls are investigated in a low-speed wind tunnel. The experimental tests include near-field and far-field noise, and the velocity of the shear layer. The elastic modes were varied using different thicknesses of bottom plates so that the cavity self-sustained oscillatory modes interacted with different elastic modes. The noise results of the flexible cavity measured in the experiment are coupled to both acoustic resonance modes and elastic modes. The results show that the coupling of the self-sustained oscillatory and elastic modes increases the sound pressure level of the mode. The flexible wall affects the velocity spectral characteristics of the shear layer as well as the far-field noise, but does not change the vortex-convection velocity dimensionless parameter

κ

. When the Rossiter mode is coupled to both acoustic resonance and elastic modes, the excitation of the two coupled modes is characterized by alternating excitation. Finally, the coupled mode frequencies of the elastic and Rossiter modes are accurately predicted based on the calculation of the phase delay term.

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腔体柔性底壁对自持振荡模态的影响

空腔内流固耦合作用影响自维持振荡流动和噪声。在低速风洞中研究了不同柔性底壁空腔的噪声和流场特性。实验测试包括近场和远场噪声以及剪切层的速度。采用不同厚度的底板改变弹性模态，使腔体的自维持振荡模态与不同的弹性模态相互作用。实验测量的柔性腔的噪声结果与声共振模态和弹性模态耦合。结果表明，自持续振荡模态与弹性模态的耦合提高了模态的声压级。柔性壁面影响剪切层的速度谱特性和远场噪声，但不改变涡对流速度无量纲参数κ。当Rossiter模与声共振模和弹性模同时耦合时，两种耦合模的激励表现为交替激励。最后，基于相位延迟项的计算，准确预测了弹性模态和罗西特模态的耦合频率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.