Establishing universal scaling laws for pressure fluctuations in high Reynolds number rough wall turbulent boundary layers

建立高雷诺数粗糙壁湍流边界层中压力波动的通用标度定律

基本信息

批准号：
1436088
负责人：
William Devenport
金额：
$ 22.83万
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：
2014
资助国家：
美国
起止时间：
2014-09-01 至 2017-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1436088&HistoricalAwards=false
关键词：
Establishing universal scaling laws pressure

Establishing universal scaling laws pressure

项目摘要

PI: Devenport, William JProposal Number: 1436088The goal of the proposed research is to investigate experimentally and theoretically the scaling of pressure fluctuations in high Reynolds number boundary layers over rough walls. The focus of the work will be on practically and scientifically-relevant conditions at which most vehicles operate and at which universal behaviors are most likely to be observed. Results from the proposed research could have a strong impact on engineering for prediction of sound and vibration produced by boundary layers, and on scientific understanding of pressure effects with the development of a predictive function for rough-wall boundary layer pressure spectra.The proposed work is based on recent findings that pressure fluctuations within turbulent boundary layers over rough surfaces behave differently that velocity fluctuations, and this different behavior is important. The PI proposes to conduct experiments in a rather unique facility at Virginia Tech to explore the wall-pressure spectrum and the turbulence scales that it reveals. Prior results indicate that there are three different scaling regions (low, medium and high frequency), and the proposed experiments aim to establish the persistence of these scalings, and the physical processes they imply, as the geometry and density of the roughness elements is varied. Proposed are also experiments on a two-scale surface that could lead to the development of an interpolation function for rough-wall boundary layer pressure spectra. The proposed work would be important for the theory of boundary layer turbulence with engineering applications where noise is a concern, such as vehicle design (cars, planes, helicopters) and wind turbines. The proposal also offers a plan to integrate research with education. High school, undergraduate and graduate students will be involved in designing and building parts of the wind tunnel as well as manufacturing of the new rough surfaces, providing a complete hands-on, engineering experience.

PI：Devenport，William Jproposal编号：1436088拟议的研究的目的是在实验和理论上研究高雷诺数高雷诺数边界层中压力波动的缩放。这项工作的重点将放在大多数车辆操作的实际和科学上的条件上，并且最有可能观察到普遍的行为。拟议的研究的结果可能对工程技术产生强大的影响，以预测边界层产生的声音和振动，以及对压力效应的科学理解，并发展出粗糙的边界层压力谱的预测功能的发展。拟议的工作是基于最新的发现，即在粗糙的边界内的压力波动在粗糙的边界内的压力波动在粗糙的边界内的行为不同，这是不同的，这是不同的，这是不同的行为和这种不同的行为，并且是不同的行为，并且是不同的行为。 PI建议在弗吉尼亚理工大学的一个相当独特的设施中进行实验，以探索壁压光谱和揭示其湍流尺度。先前的结果表明，有三个不同的缩放区域（低，中和高频），并且提出的实验旨在确定这些尺度的持久性，以及它们所暗示的物理过程，因为粗糙度元素的几何形状和密度有所不同。提出的也是在两尺度表面上进行的实验，这可能导致粗壁边界层压力光谱的插值函数的发展。提出的工作对于通过工程应用程序的边界层湍流理论很重要，而工程应用是噪声的关注点，例如车辆设计（汽车，飞机，直升机）和风力涡轮机。该提案还提供了将研究与教育整合在一起的计划。高中，本科生和研究生将参与设计和建造风洞的部分以及新的粗糙表面的制造，提供完整的动手工程经验。