Experimental analysis of jet noise and thrust in nozzles with zigzag-shaped vortex generators

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-08-29 DOI:10.1016/j.apacoust.2025.111036

Felipe A.F. Câmara , Victor H.P. Rosa , Cesar J. Deschamps , Filipe D. da Silva

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Abstract

This paper reports an experimental analysis of a vortex generator adopted to reduce the noise emitted by subsonic jets of aero-engines. This noise reduction device consists of a tape adhered to the inner surface of the nozzle near its exit, covering the entire nozzle circumference and featuring a zigzag pattern, with a thickness approximately 1% of the nozzle diameter. Acoustic and hot-wire measurements were conducted in an anechoic chamber to quantify the thrust reduction due to the vortex generator and correlate the observed noise reduction with changes in flow turbulence. The device increases the turbulence intensity in the shear layer near the nozzle exit whilst reducing it further downstream. These changes in the flow turbulence reduce the noise emission at low to mid frequencies but increases at higher frequencies. The results for a jet at an acoustic Mach number of 0.5 showed that noise reduction achieved with the vortex generator is sustained, even when the nozzle exit velocity is increased to compensate for a minor decrease in thrust. This finding is significant, as previous studies involving vortex generators did not assess the thrust penalty.

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锯齿形涡发生器喷嘴内射流噪声与推力的实验分析

本文报道了一种用于降低航空发动机亚音速射流噪声的涡发生器的实验分析。该降噪装置由粘在喷嘴出口附近内表面的胶带组成，覆盖整个喷嘴周长，呈锯齿状，厚度约为喷嘴直径的1%。声学和热线测量是在消声室中进行的，以量化由于涡流发生器造成的推力减少，并将观察到的噪声减少与流动湍流度的变化联系起来。该装置增加了喷嘴出口附近剪切层的湍流强度，同时降低了下游的湍流强度。流动湍流度的这些变化降低了中低频的噪声发射，但增加了高频的噪声发射。对于声学马赫数为0.5的射流，结果表明，即使喷嘴出口速度增加以补偿推力的轻微减少，使用涡发生器实现的降噪也是持续的。这一发现意义重大，因为之前涉及涡发生器的研究并没有评估推力损失。

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.