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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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.