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Collaborative Research: The Pressure Shielding of Aerodynamic Surfaces

合作研究：气动表面的压力屏蔽

基本信息

批准号：
1802961
负责人：
Stewart Glegg
金额：
$ 15.95万
依托单位：
Florida Atlantic 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=1802961&HistoricalAwards=false
关键词：
Collaborative Research Pressure Shielding Aerodynamic

项目摘要

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.

诸如风力涡轮机叶片、飞机机翼、螺旋桨或风扇等设备的表面都是为了以有益的方式控制空气流动而设计的。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，从而导致不希望的振动或声音。这项研究的目的是了解如何在表面上方进行处理，从而大大降低压力波动，而不会对表面对流动的有益影响产生负面影响。这项工作将包括弗吉尼亚理工大学的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外，还将重点放在博士和本科生的研究培训上。特别是，这些实验将与弗吉尼亚理工大学要求的本科实验室相结合，在整个项目过程中影响数百名学生。这项工作的主要目标是为表面处理建立基本的科学基础，以减少湍流表面压力波动，同时保持大多数流体动力学应用中所需的壁面法向动量传输和低阻力。最近的研究明确表明，压力屏蔽是可能的。这项工作的目的是为这些效应背后的机制提供定量可用的基本理解，以及预测它们所需的数学方法。研究重点是压力屏蔽处理在两种基本流中的应用；均匀湍流中与壁面相邻形成的无剪切边界层和传统的平板湍流边界层。之所以选择这些流量，是因为它们可以将一些主要的压力屏蔽机制清晰地分离开来。由于存在这些流的完整相关结构的分析或实验模型，它们在几何上也很简单，特征也很好。弗吉尼亚理工大学将对这些结构进行大规模实验，并对其进行处理。佛罗里达大西洋大学将进行并行数学建模。通过这项密切相关的研究，我们不仅希望提取压力屏蔽的基本性质，而且还希望建立数学上有充分根据的预测所需的分析工具。一个关键目标是为来自不同学术水平的学生提供研究教育。计划中的工作包括由两所大学的本科生和高中生小组执行的具体任务。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。