Collaborative Research: The Pressure Shielding of Aerodynamic Surfaces

合作研究：气动表面的压力屏蔽

• 批准号: 1802915
• 负责人: William Devenport
• 金额: $ 34.03万
• 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: 2018
• 资助国家: 美国
• 起止时间: 2018-07-15 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1802915&HistoricalAwards=false
• 关键词: Collaborative; Research; Pressure; Shielding; Aerodynamic

The surfaces of devices such as a wind turbine blade, of an airplane wing, of a propeller or fan are all designed to manage the flow of air in a beneficial way. However, turbulence that inevitably accompanies the flow produces pressure fluctuations on a surface that can result in undesirable vibration or sound. This research effort is directed at understanding how treatments placed just above a surface might be able to substantially reduce the pressure fluctuations, without negatively impacting the beneficial effects of a surface on the flow. The work will involve coordinated wind tunnel experiments at Virginia Tech, and theoretical studies at Florida Atlantic University. As well as advancing science and engineering in the area of fluid dynamics, the effort will be focused on the research training of PhD and undergraduate students. In particular the experiments will be integrated with required undergraduate laboratories at Virginia Tech, impacting several hundred students over the course of the project.The main objective of this work is to establish the fundamental scientific basis for surface treatments that reduce turbulent surface pressure fluctuations, while maintaining the wall-normal transport of momentum and low drag that is required in most fluid dynamic applications. Recent studies have definitively demonstrated that pressure shielding is possible. The purpose of this work is to provide a quantitatively usable fundamental understanding of the mechanisms behind these effects, and the mathematical methods needed for their prediction. The research program is focused on the application of pressure shielding treatments to two fundamental flows; the shear-free boundary layer formed adjacent to a wall in homogeneous turbulence, and a conventional flat plate turbulent boundary layer. These flows have been chosen since they cleanly separate some of the major mechanisms expected to be responsible for pressure shielding. They are also geometrically simple and well characterized, since analytical or experimental models of the complete correlation structure of these flows exist. Large scale experiments on these configurations with and without treatment, will be performed at Virginia Tech. Parallel mathematical modeling will be carried out at Florida Atlantic University. Through this closely linked study we expect not only to extract the fundamental nature of the pressure shielding, but also to build mathematically well-founded analytical tools needed for its prediction. A key goal is to provide research education to a diverse group of students drawn from a broad range of academic levels. The planned work includes specific tasks to be conducted by groups of undergraduate and high school students across both institutions.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.

风力涡轮机叶片、飞机机翼、螺旋桨或风扇等设备的表面均被设计为以有益的方式管理空气流动。然而，不可避免地伴随着流动的湍流会在表面上产生压力波动，从而导致不良的振动或声音。这项研究工作旨在了解放置在表面上方的处理如何能够显着减少压力波动，而不会对表面对流动的有益影响产生负面影响。这项工作将涉及弗吉尼亚理工大学的协调风洞实验和佛罗里达大西洋大学的理论研究。除了推进流体动力学领域的科学和工程之外，我们还将重点关注博士生和本科生的研究培训。特别是，这些实验将与弗吉尼亚理工大学所需的本科实验室相结合，在项目过程中影响数百名学生。这项工作的主要目标是为减少湍流表面压力波动的表面处理建立基础科学基础，同时保持大多数流体动力学应用所需的壁面法向动量传输和低阻力。最近的研究明确证明压力屏蔽是可能的。这项工作的目的是提供对这些效应背后的机制以及预测所需的数学方法的定量可用的基本理解。 该研究项目的重点是压力屏蔽处理在两种基本流动中的应用；在均匀湍流中邻近壁形成的无剪切边界层，以及传统的平板湍流边界层。选择这些流程是因为它们干净地分离了一些预计负责压力屏蔽的主要机制。它们在几何上也很简单并且特征良好，因为存在这些流的完整相关结构的分析或实验模型。弗吉尼亚理工大学将在经过或未经处理的情况下对这些配置进行大规模实验。并行数学建模将在佛罗里达大西洋大学进行。通过这项密切相关的研究，我们不仅期望提取压力屏蔽的基本性质，而且还构建预测所需的数学上有充分依据的分析工具。一个关键目标是为来自不同学术水平的多元化学生群体提供研究教育。计划的工作包括由两个机构的本科生和高中生小组执行的具体任务。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值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

The effect of shear sheltering on trailing edge noise

剪切屏蔽对后缘噪声的影响

• DOI: 10.2514/6.2020-2515
• 发表时间: 2020
• 期刊: AIAA AVIATION FORUM
• 作者: Jimenez, Ignacio;Glegg, Stewart A.;Devenport, William J.
• 通讯作者: Devenport, William J.

Flow Field Analysis Around Pressure Shielding Structures

压力屏蔽结构周围的流场分析

• 发表时间: 2021
• 期刊: AIAA Aviation 2021
• 作者: M. Szoke, N. Hari

Understanding Pressure Shielding by Canopies

了解顶篷的压力屏蔽

• DOI: 10.2514/6.2021-0817
• 发表时间: 2021
• 期刊: AIAA SciTech 2021
• 作者: Nurani Hari, Nandita;Szoke, Máté;Devenport, William J.;Glegg, Stewart A.
• 通讯作者: Glegg, Stewart A.

Fundamental Studies of the Mechanisms of Pressure Shielding

压力屏蔽机理的基础研究

• 发表时间: 2019
• 期刊: AIAA/CEAS 25th Aeroacoustics Conference
• 作者: Gonzalez, A;Glegg, S.;Hari, N.;Ottman, M.;Devenport, W.
• 通讯作者: Devenport, W.

Development and Calibration of a new Anechoic Wall Jet Wind Tunnel

新型消声墙射流风洞的开发和校准

• DOI: 10.2514/6.2019-1936
• 发表时间: 2019
• 期刊: AIAA Science and Technology Forum and Exposition 2019
• 作者: Kleinfelter, Austin W.;Repasky, Russell;Hari, Nandita;Letica, Stefan;Vishwanathan, Vidya;Organski, Lee;Schwaner, Jon;Alexander, William N.;Devenport, William J.
• 通讯作者: Devenport, William J.