A fundamental investigation into high-speed jet hydrodynamic field

随着空中交通的持续长期增长，航空当局正在实施越来越严格的噪音法规，使得飞机噪音领域成为航空航天工业和科学界的一个及时和有趣的领域。尽管在过去的几十年里进行了大量的研究，并在降低喷气噪声方面取得了进展，但喷气发动机设计的变化带来了新的航空声学现象，人们对这些现象仍然知之甚少。本项目旨在通过对隔离和安装的亚音速射流的动力学和声学进行全面的理论和实验研究，扩展现有的射流噪声产生机制的物理基础知识。此外，还将研究被动或主动操纵射流流场、射流羽流中的能量级联以及流动不稳定性来实现近场和远场降噪的可能性。这项研究的结果预计将具有很高的影响力，并将发表在该领域的顶级期刊上。

As air traffic continues its long-term growth, aviation authorities are imposing increasingly stringent noise regulations, making the field of jet noise a timely and interesting area both for the aerospace industry as well as the scientific community. Despite the significant amount of research that has been carried out and the progress made in reducing jet noise during the past few decades, changes in the design of jet engines have brought about new aeroacoustic phenomena that remain poorly understood. This project aims to expand on the existing knowledge of the physics underlying the jet noise generation mechanism, through a comprehensive theoretical and experimental investigation of the dynamics and acoustics of isolated as well as installed subsonic jets. The possibility of passively or actively manipulating the jet flow field, the energy cascade in the jet plume and the flow instabilities to achieve near-field and far-field noise reduction will also be investigated. The results of this research are expected to be of high-impact and be published in the field's top journals.