减轻低频嚎叫的发动机试验设备比例模型研究

IF 1.2 4区工程技术 Q3 ACOUSTICS

International Journal of Aeroacoustics Pub Date : 2024-05-09 DOI:10.1177/1475472x241230654

K. Zaman, D. J. Dicki

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引用次数: 0

摘要

针对美国国家航空航天局格伦研究中心推进系统实验室（PSL）发动机测试期间出现的嚎叫声，进行了一项比例模型实验研究。目的是了解嚎叫噪声的来源，并找到可能的补救措施。研究表明，向 PSL 入口管道模型排放的喷气会产生高水平的低频噪声。这显然是由于喷流随机激发的管道声学模式造成的。在模型管道末端放置的不同网眼尺寸和结构的金属丝网筛网以及卡板都会对噪声产生影响。对这些配置的比较效果进行了研究，发现其中一些配置能显著减轻低频噪声。根据这些结果，建议采用相当于 4 目滤网的滤网作为 PSL 设备管道的末端处理。

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A scale model study of an engine test facility for alleviating low-frequency howl

A scale model experimental study is conducted addressing howl occurring during engine tests in the Propulsion Systems Laboratory (PSL) of NASA Glenn Research Center. The aim is to understand the sources of the howling noise and find possible remedies. It is shown that a jet discharged into the model of the PSL entrance duct gives rise to high levels of low frequency noise. This occurs apparently due to duct acoustic modes randomly excited by the jet. Wire-mesh screens of various mesh size and configuration as well as tabs, placed at the end of the model duct, are shown to affect the noise. Comparative effects of these configurations are studied, and some are found to alleviate the low-frequency noise significantly. Based on these results, the equivalent of a 4-mesh screen is recommended as the end treatment for the duct of the PSL facility.

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来源期刊

International Journal of Aeroacoustics ACOUSTICS-ENGINEERING, AEROSPACE

CiteScore

2.10

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： International Journal of Aeroacoustics is a peer-reviewed journal publishing developments in all areas of fundamental and applied aeroacoustics. Fundamental topics include advances in understanding aeroacoustics phenomena; applied topics include all aspects of civil and military aircraft, automobile and high speed train aeroacoustics, and the impact of acoustics on structures. As well as original contributions, state of the art reviews and surveys will be published. Subtopics include, among others, jet mixing noise; screech tones; broadband shock associated noise and methods for suppression; the near-ground acoustic environment of Short Take-Off and Vertical Landing (STOVL) aircraft; weapons bay aeroacoustics, cavity acoustics, closed-loop feedback control of aeroacoustic phenomena; computational aeroacoustics including high fidelity numerical simulations, and analytical acoustics.