On the analytical acoustic propagation and mode decomposition method in C-duct

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-03-31 DOI:10.1016/j.apacoust.2025.110704

Wei Dai , Weirui Qin , Xiaoyu Wang , Guangyu Zhang , Xiaofeng Sun

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引用次数: 0

Abstract

Aft-fan aero-engine nacelle noise is a significant component of overall aero-engine noise. The need for optimizing aft-fan liners necessitates a deeper understanding of acoustic propagation within the aft-fan duct. This study develops an analytical model for acoustic propagation in C-ducts to examine the effects of mode scattering in C-ducts due to incident modes from the annular duct. In a theoretical infinite duct system composed of both an annular duct and a C-duct, we illustrate the relationship between modes in the annular and C-ducts using analytical expression. Additionally, we identify and validate the methods and prerequisites for generating a single C-duct mode, which will aid in advancing the understanding of acoustic propagation mechanisms in C-ducts. Simulations and experiments are conducted to compare with the analytical results. Furthermore, mode decomposition methods for C-ducts are presented during experiments. To ensure the accuracy of decomposition results, we discuss methods for evaluating errors with different placement of measuring points.

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c -管道中解析声传播及模态分解方法研究

后扇式航空发动机机舱噪声是整个航空发动机噪声的重要组成部分。为了优化后扇管道，需要对后扇管道内的声波传播有更深入的了解。本研究建立了c -管道中声传播的解析模型，以研究环形管道入射模式对c -管道中模式散射的影响。在一个由环形管道和c型管道组成的理论无限管道系统中，我们用解析表达式说明了环形管道和c型管道中模态之间的关系。此外，我们确定并验证了生成单个c -管道模式的方法和先决条件，这将有助于促进对c -管道中声音传播机制的理解。通过仿真和实验与分析结果进行了比较。在此基础上，提出了c型管的模态分解方法。为了保证分解结果的准确性，我们讨论了不同测点放置误差的评估方法。

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.