Acoustic experimental investigation of the acoustic resonant influence on Rossiter modal tones at the locked-on state

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-04-18 DOI:10.1016/j.apacoust.2025.110671

Yuan Liu , Peiqing Liu , Hao Guo , Tianxiang Hu , Jin Zhang

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Abstract

In this work, the complex interactions of the inherent instability of the separated shear layer and an acoustic mode of the cavity noise at the locked-on state are studied within a low-speed wind tunnel. Experimental results for near- and far-field acoustics in rectangular cavities with varying widths and depths are provided for flow velocities ranging from 10 to 35 m/s. The geometry of the rectangular cavity is specially designed with an excited tone related to the first depth mode of acoustic resonance. Differences between the locked-on and non-locked-on states are highlighted. At the non-locked-on state, the tonal frequency is well predicted by the Rossiter formula; whereas, at the locked-on state, it is found to deviate from the Rossiter formula and the dominant mode selection behavior of Rossiter tones is inconsistent with those reported at the non-locked-on state. However, the mode switching behavior can be observed with similar results by the wavelet analysis method for both states, showing a week influence of the acoustic resonance on the intermittency behavior of the sustained oscillation due to the inherent instability of the separated shear layer.

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锁定状态下声学共振对罗西特模态音调影响的声学实验研究

本文在低速风洞中研究了分离剪切层的固有不稳定性与闭锁状态下腔噪声的声学模式之间的复杂相互作用。本文给出了不同宽度和深度的矩形腔体在10 ~ 35m /s流速范围内的近场和远场声学实验结果。矩形腔体的几何形状特别设计了与声共振第一深度模式相关的激发态。突出显示了锁定状态和非锁定状态之间的差异。在非锁定状态下，用罗西特公式可以很好地预测音调频率；然而，在锁定状态下，发现它偏离了Rossiter公式，Rossiter音调的主导模式选择行为与非锁定状态下的报道不一致。然而，通过对两种状态的小波分析方法，可以观察到模式切换行为的相似结果，表明由于分离剪切层的固有不稳定性，声共振对持续振荡的间歇性行为有一周的影响。

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.