CAREER: Revealing the characteristics of high Reynolds number wakes with rotation

职业：揭示高雷诺数旋转尾流的特征

• 批准号: 1652583
• 负责人: Marcus Hultmark
• 金额: $ 55万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-03-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1652583&HistoricalAwards=false
• 关键词: CAREER; Revealing; characteristics; Reynolds; number

This project aims to reveal and characterize the behavior of the flow behind large rotating machines, such as wind or tidal turbines, as well as interactions between such machines. This will be achieved by the combination of a unique experimental flow facility and numerical modeling. Since these machines are typically very large, one needs to accurately account for effects due to inertia and rotation of the flow in model tests and simulations. By using a unique high-pressure flow facility, in combination with state of the art instrumentation, the details of the flow behind a wind turbine will be studied under conditions identical to those of a full scale modern wind or tidal turbine. This work will bridge the gap between previous laboratory research, numerical models, field experiments and the real-world applications, answering open fundamental questions about the scaling of the flow characteristics, as well as the power output and forces acting on the turbine. Furthermore, the numerical component of the project will allow us to perform unique comparisons and evaluation of available models and to improve these modeling approaches further. Improved models can in term result in more cost-efficient designs as well as a better understanding of maintenance guidelines. The primary objective of the proposed research program is to reveal and characterize the morphology and fundamental scaling of wakes generated by rotating machinery over an unprecedented range of Reynolds numbers. The research will enable a unique insight into the details of wakes created by wind and hydrokinetic turbines, which traditionally has not been possible in controlled environments. The combination of high Reynolds numbers and rotation makes attempts to accurately simulate these flows very challenging. The proposed research will combine a recently developed experimental test facility, a custom designed Particle Image Velocimetry system, and novel nanoscale sensors to enable detailed and accurate characterization of the fluid mechanics within rotating wakes. Focus will be aimed at providing knowledge that can improve our ability to model and predict the performance and interactions between these kinds of machines. The proposed research program will permit us to bridge the current gap between previous laboratory research, numerical models, field experiments and the real-world applications, answering open fundamental questions about the scaling and dynamics of the momentum distribution, turbulent fluctuations, structure and meandering of the wake as well as scalability of conventional research efforts.The main objective of the education part of the proposed project is to integrate design into an introductory engineering laboratory course, in order to give the students ownership of the labs and teach them modern engineering tools in an interdisciplinary fashion. The new course will challenge the students to build their own tools and test benches from robust, low cost and open source components to test their ideas and the concepts they have read about. The format of the proposed laboratory course is such that it can be easily adopted by other educators and will be cost efficient.

该项目旨在揭示和描述大型旋转机器（如风力涡轮机或潮汐涡轮机）后面的流动行为，以及这些机器之间的相互作用。这将通过独特的实验流动设施和数值模拟相结合来实现。由于这些机器通常非常大，因此需要在模型测试和模拟中准确地考虑由于流动的惯性和旋转而产生的影响。通过使用独特的高压流动设施，结合最先进的仪器，将在与全尺寸现代风力或潮汐涡轮机相同的条件下研究风力涡轮机后面的流动细节。这项工作将弥合以前的实验室研究，数值模型，现场实验和现实世界的应用之间的差距，回答开放的基本问题的缩放的流动特性，以及功率输出和作用力的涡轮机。此外，该项目的数值部分将使我们能够对现有模型进行独特的比较和评估，并进一步改进这些建模方法。改进的模型可以在长期内导致更具成本效益的设计，以及更好地理解维护指南。 拟议的研究计划的主要目标是揭示和表征的形态和基本缩放的尾流产生的旋转机械在一个前所未有的范围内的雷诺数。这项研究将使人们能够独特地了解风力和水力涡轮机产生的尾流细节，这在传统上是不可能在受控环境中实现的。高雷诺数和旋转的组合使得精确模拟这些流动的尝试非常具有挑战性。拟议的研究将结合联合收割机最近开发的实验测试设施，定制设计的粒子图像测速系统，和新型纳米级传感器，使旋转尾流内的流体力学的详细和准确的表征。重点将旨在提供知识，可以提高我们建模和预测这些机器之间的性能和相互作用的能力。拟议的研究计划将使我们能够弥合以前的实验室研究，数值模型，现场实验和现实世界的应用之间的差距，回答有关动量分布，湍流波动，结构和蜿蜒的尾流以及传统的研究工作的可扩展性。拟议项目的教育部分的主要目标是将设计融入工程实验室入门课程，以便让学生拥有实验室，并以跨学科的方式教授他们现代工程工具。新课程将挑战学生从强大，低成本和开源组件构建自己的工具和测试台，以测试他们的想法和他们所阅读的概念。 拟议的实验课程的形式，使其他教育工作者容易采用，并符合成本效益。

项目成果

The effect of porosity on the drag of cylinders

• DOI: 10.1017/jfm.2020.606
• 发表时间: 2020-08
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: K. Steiros;K. Kokmanian;N. Bempedelis;M. Hultmark

Dynamic stall at high Reynolds numbers due to variant types of airfoil motion

由于翼型运动的不同类型，高雷诺数下的动态失速

• DOI: 10.1088/1742-6596/1618/5/052028
• 发表时间: 2020
• 期刊: Journal of Physics: Conference Series
• 作者: Kiefer, J;Brunner, C E;Hultmark, M;Hansen, MOL
• 通讯作者: Hansen, MOL

Vertical-axis wind turbine experiments at full dynamic similarity

• DOI: 10.1017/jfm.2018.197
• 发表时间: 2017-11
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: M. Miller;S. Duvvuri;I. Brownstein;Marcus Lee;J. Dabiri;M. Hultmark

Dynamic stall at high Reynolds numbers induced by ramp-type pitching motions

斜坡型俯仰运动引起的高雷诺数动态失速

• DOI: 10.1017/jfm.2022.70
• 发表时间: 2022
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Kiefer, Janik;Brunner, Claudia E.;Hansen, Martin O.L.;Hultmark, Marcus
• 通讯作者: Hultmark, Marcus

Comparison of dynamic stall on an airfoil undergoing sinusoidal and VAWT-shaped pitch motions

经历正弦和 VAWT 形俯仰运动的机翼动态失速的比较

• DOI: 10.1088/1742-6596/2265/3/032006
• 发表时间: 2022
• 期刊: Journal of Physics: Conference Series
• 作者: Brunner, C E;Kiefer, J;Hultmark, M
• 通讯作者: Hultmark, M