Acoustic Measurements of Swirling Jets

旋流射流的声学测量

• 批准号: EP/D046440/1
• 负责人: John Cater
• 金额: $ 16.18万
• 依托单位: Queen Mary University of London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD046440%2F1
• 关键词: Acoustic; Measurements; Swirling; Jets

This project aims to develop a facility for generating and measuring the acoustics of round jets in air. The project will use a variety of fluid velocity and visualisation techniques to reveal the underlying structure and dynamic processes in the region close to the jet exhaust. This will be conducted with simultaneous acoustic measurements. It is expected that a detailed knowledge of this area and the way the flow rotates will lead to more effective methods for controlling noise.The effect of swirling motions on the noise generated by the jets will be investigated. A mean swirl around the jet axis occurs in a variety of important practical situations, such as at the exhaust from a commercial jet engine. However, the effects of swirl on the resulting structure and noise produced by the jet are not well understood.Additionally, techniques for controlling the amount of swirl will be studied using small synthetic jets. These are pulsing flow actuators that can be used to disturb a flow without net mass addition.

该项目旨在开发一种设施，以生成和测量空气中的圆形喷气机的声学。该项目将使用各种流体速度和可视化技术来揭示靠近射流排气的区域的基础结构和动态过程。这将通过同时进行声学测量进行。可以预期，对该区域的详细知识以及流动旋转的方式将导致更有效的方法来控制噪声。将研究旋转运动对喷气机产生的噪声的影响。围绕喷气轴的平均旋转发生在各种重要的实际情况下，例如在商用喷气发动机的排气中。但是，漩涡对射流产生的结构和噪声的影响尚不清楚。在此方面，将使用小型合成喷头研究控制漩涡量的技术。这些是脉冲流动器，可用于干扰流量而无需添加净质量。