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

• 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

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 J 提案编号：1436088 拟议研究的目标是从实验和理论上研究粗糙壁上高雷诺数边界层中压力波动的缩放。这项工作的重点将是大多数车辆运行的实际和科学相关条件以及最有可能观察到普遍行为的条件。拟议研究的结果可能会对边界层产生的声音和振动的预测工程产生重大影响，并随着粗糙壁边界层压力谱预测函数的发展，对压力效应的科学理解产生重大影响。拟议的工作基于最近的发现，即粗糙表面上的湍流边界层内的压力波动与速度波动的行为不同，这种不同的行为很重要。 PI 提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，以探索壁压力谱及其揭示的湍流规模。先前的结果表明，存在三种不同的缩放区域（低、中和高频），并且所提出的实验旨在确定这些缩放的持久性，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是变化的。还提出了在两尺度表面上进行的实验，这可能导致粗糙壁边界层压力谱插值函数的开发。 拟议的工作对于边界层湍流理论和涉及噪声问题的工程应用非常重要，例如车辆设计（汽车、飞机、直升机）和风力涡轮机。 该提案还提出了一项将研究与教育相结合的计划。高中生、本科生和研究生将参与风洞部件的设计和建造以及新型粗糙表面的制造，提供完整的实践工程经验。