UNS: Physical Mechanisms of Wall-Bounded Turbulence and Turbulent Mixing at Extreme Reynolds

UNS：极端雷诺下壁界湍流和湍流混合的物理机制

• 批准号: 1510100
• 负责人: Marcus Hultmark
• 金额: $ 31.93万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1510100&HistoricalAwards=false
• 关键词: UNS; Physical; Mechanisms; Wall; Bounded; UNS; Physical; Mechanisms; Wall; Bounded

1510100(Hultmark)The goal of the proposed research is to improve our theoretical understanding and modeling of turbulent flow close to a solid object, which is the most important and relevant to engineering applications class of turbulent flows (since turbulence found in industrial processes, aerospace and naval applications, and in the atmospheric boundary layer fall within this class). A new experimental technique for measuring velocity fluctuations at resolutions that are one order of magnitude finer than currently available techniques is also proposed.Because of the complexity of turbulent flows, it is very challenging to obtain high quality experimental data and to conduct high fidelity numerical simulations at the scales and resolutions that have practical interest and that are needed to validate theoretical advances. Detailed studies have often been replaced with simple parameterizations and correlations. Simple analogies between momentum transfer and heat transfer have been the foundation for most turbulent heat transfer models, even if it is well-known that these analogies perform poorly in many applications. While significant breakthroughs have taken place in the last twenty years, there are still limitations in current instrumentation and high Reynolds number studies have often been limited to measurements of only one component of the velocity vector. This is where the contribution of the proposed work is: it proposes a study of turbulent transport over a wide range of Reynolds numbers. It is proposed to overcome experimental limitations by deploying novel MEMS-based flow sensors. By combining the proposed novel instrumentation with a heated pipe-flow facility, unprecedented multi-component velocity and temperature data are expected to be obtained in a unique facility, the Princeton Superpipe, at extreme Reynolds numbers. In addition fundamental theoretical work will be conducted to integrate the study of turbulent heat transfer with turbulent momentum studies. Results from this work, if successful, has the potential to increase the capabilities of laboratory setups across the world. Educational and outreach activities that include graduate and undergraduate students, and restructuring of undergraduate lab courses are proposed. Activities of the project will find leverage from an existing REU program at Princeton.

1510100（Hultmark）拟议的研究的目的是提高我们对靠近固体物体的湍流的理论理解和建模，这是与工程应用程序类别的湍流类别类别（自工业过程，航空航天和海军应用中发现的湍流，以及在大气边界层中发现的湍流）。还提出了一种用于测量速度波动的新实验技术，该技术还提出了比当前可用技术要少的一个数量级的顺序。由于动荡流的复杂性，获得高质量的实验数据并在尺度上进行高忠诚度模拟的高忠诚度和解决方案以实用的效果和解决方案，这是非常具有挑战性的。详细的研究通常被简单的参数化和相关性取代。动量转移和传热之间的简单类比已成为大多数湍流传热模型的基础，即使众所周知，这些类比在许多应用中的表现较差。尽管在过去的二十年中发生了重大突破，但目前的仪器仍存在局限性，而雷诺数高的研究通常仅限于仅测量速度向量的一个组成部分。这是拟议作品的贡献的地方：它提出了一项在雷诺数字范围内的湍流运输的研究。提议通过部署基于MEMS的新型流动传感器来克服实验局限性。通过将提出的新型仪器与加热管流的设施相结合，预计将在极端雷诺数的独特设施（普林斯顿超级管道）中获得前所未有的多组分速度和温度数据。 另外，将进行基本的理论工作，以将湍流传热的研究与湍流动量研究相结合。 如果成功的话，这项工作的结果有可能提高全球实验室设置的能力。提出了包括研究生和本科生的教育和外展活动，并提出了本科实验室课程的重组。该项目的活动将从普林斯顿现有的REU计划中找到杠杆作用。