Noise-reduction mechanisms in jet engines: chevrons are the answer

喷气发动机的降噪机制：人字形就是答案

• 批准号: DE240100933
• 负责人: Dr Petronio Augusto Santos Nogueira
• 金额: $ 31.72万
• 依托单位: Monash University
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Early Career Researcher Award
• 财政年份: 2024
• 资助国家: 澳大利亚
• 起止时间: 2024-01-01 至 2026-12-31
• 项目状态: 未结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DE240100933
• 关键词: Noise; reduction; mechanisms; jet; engines

This project aims to develop new models to study the influence of chevrons on the exhaust of aircraft engines, which is one of the strongest sound sources during take-off. As constant exposure to high-amplitude noise in areas close to airports leads to a myriad of health problems, new strategies have been sought to mitigate this noise component. Chevrons may modify the dynamics of the noise-generating coherent structures, but most of their parameters are chosen by trial and error, and the mechanism that maximises noise reduction is not clear. By understanding the underlying noise-reduction mechanisms, this project will facilitate the optimal design of quieter exhaust nozzles, ameliorating the effect of aircraft noise on the local community.

该项目旨在开发新的模型来研究人字形发动机对飞机发动机尾气的影响，发动机是起飞过程中最强的声源之一。由于机场附近地区持续暴露在高幅噪声中会导致无数的健康问题，人们已经寻求新的策略来减轻这种噪声成分。人字形可能会改变产生噪音的相干结构的动力学，但它们的大多数参数都是通过反复试验来选择的，最大化降噪的机制尚不清楚。通过了解潜在的降噪机制，该项目将有助于优化设计更安静的排气喷嘴，改善飞机噪音对当地社区的影响。