EAGER: Improving the Aeroacoustic Properties of Hybrid Anechoic Wind Tunnels

EAGER：改善混合消声风洞的气动声学特性

• 批准号: 2012443
• 负责人: William Devenport
• 金额: $ 19.55万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-01-15 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2012443&HistoricalAwards=false
• 关键词: EAGER; Improving; Aeroacoustic; Properties; Hybrid

Wind tunnels are a fundamental part of the engineering and scientific process used to develop quieter and more efficient aircraft, wind turbines, and other systems. The hybrid anechoic wind tunnel, introduced some 13 years ago, provides a way to substantially increase the accuracy and scope of wind tunnel tests concerned with flow generated noise. This configuration, which has already been adopted by a number of research facilities across the world relies on “acoustic windows” – large panels of tensioned fabric that are transparent to sound but largely impervious to flow. Such windows have been made from commercially available Kevlar fabric which has many desirable characteristics for this purpose, but the fabric was designed for composites manufacture. A Kevlar fabric explicitly designed for wind tunnel applications promises additional benefits – an even quieter test environment and embedded instrumentation that can monitor the flow. Under this project, an interdisciplinary team of textiles, acoustics, and aerodynamics researchers will conduct a short-term research program to develop these materials. This innovative, potentially high payoff effort, promises to bring the advantages of hybrid anechoic testing to national scale facilities and greatly enhance the development quieter and more efficient vehicles and systems. This project will also be dedicated to research education at the postdoc, graduate and undergraduate levels. This research is based upon the observation that Kevlar fabric used as acoustic windows generates noise at high frequencies (10kHz) that potentially limits the application of this technology in the context of national scale wind tunnel facilities that perform applied model scale testing for vehicle development by industry and government. The hypothesis is that the noise is made by pores in the fabric that serve no useful aeroacoustic function. Adjusting the weave to eliminate the pores requires the multi-disciplinary collaboration needed to perform a systematic study of the optimum fabric design for aeroacoustic applications. The work is being performed by a team of researchers from Virginia Tech, Florida Atlantic University, and NC State. The NC State group will use a research loom fabricate the needed modified fabrics and also investigate the feasibility of embedding sensors. Wind tunnel experiments directed at documenting and understanding the aeroacoustic performance of the fabrics will be performed at Virginia Tech, which will also provide input on sensor choices and requirements. Theoretical modeling and understanding of the nature of the acoustic source will be performed at Florida Atlantic University. Together this effort is expected to generate robust recommendations for optimal acoustic window design and embedded sensors that can be adopted by current and planned hybrid anechoic wind tunnels.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

风洞是用于开发更安静、更高效的飞机、风力涡轮机和其他系统的工程和科学过程的基本组成部分。大约 13 年前推出的混合消声风洞提供了一种方法，可以大幅提高与流动产生的噪声相关的风洞测试的准确性和范围。这种配置已经被世界各地的许多研究机构采用，它依赖于“声学窗口”——大片张紧织物，对声音是透明的，但基本上不影响流动。这种窗户是由市售的凯夫拉尔织物制成的，该织物具有许多用于此目的的所需特性，但该织物是为复合材料制造而设计的。专为风洞应用而设计的 Kevlar 织物具有额外的优势——更安静的测试环境和可以监控流量的嵌入式仪器。在该项目下，由纺织、声学和空气动力学研究人员组成的跨学科团队将开展短期研究计划来开发这些材料。这项具有潜在高回报的创新工作有望将混合消声测试的优势引入国家规模的设施，并极大地促进更安静、更高效的车辆和系统的开发。该项目还将致力于博士后、研究生和本科生的研究教育。这项研究基于这样的观察：用作隔音窗的 Kevlar 织物会产生高频 (10kHz) 噪音，这可能会限制该技术在国家级风洞设施中的应用，这些风洞设施为行业和政府的车辆开发进行应用模型规模测试。假设噪声是由织物中的孔隙产生的，这些孔隙没有提供有用的气动声学功能。调整编织以消除孔隙需要多学科协作，以对气动声学应用的最佳织物设计进行系统研究。这项工作由来自弗吉尼亚理工大学、佛罗里达大西洋大学和北卡罗来纳州立大学的研究人员团队进行。北卡罗来纳州立大学的研究小组将使用研究织机制造所需的改性织物，并研究嵌入传感器的可行性。旨在记录和了解织物气动声学性能的风洞实验将在弗吉尼亚理工大学进行，该实验还将提供有关传感器选择和要求的输入。对声源性质的理论建模和理解将在佛罗里达大西洋大学进行。这项工作预计将为最佳声窗设计和嵌入式传感器提出强有力的建议，可供当前和计划中的混合消声风洞采用。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Investigating the Aeroacoustic Properties of Porous Fabrics

研究多孔织物的气动声学特性

• DOI: 10.2514/1.j061385
• 发表时间: 2022
• 期刊: AIAA Journal
• 影响因子: 2.5
• 作者: Szőke, Máté;Devenport, William J.;Borgoltz, Aurélien;Alexander, W. Nathan;Hari, Nandita;Glegg, Stewart A.;Li, Ang;Vallabh, Rahul;Seyam, Abdel-Fattah M.
• 通讯作者: Seyam, Abdel-Fattah M.