EAGER: Understanding fundamental mechanisms involved in turbulence, current and wave interactions for offshore wind-turbines

EAGER：了解海上风力涡轮机湍流、水流和波浪相互作用的基本机制

• 批准号: 1348480
• 负责人: Kiran Bhaganagar
• 金额: $ 4.51万
• 依托单位: University of Texas at San Antonio
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1348480&HistoricalAwards=false
• 关键词: EAGER; Understanding; fundamental; mechanisms; involved

PI: Bhaganagar, KiranProposal Number: 1348480Institution: University of Texas at San AntonioTitle: EAGER: Understanding fundamental mechanisms involved in turbulence, current and wave interactions for offshore wind-turbinesThe wake-wake interactions are quite substantial in an offshore wind turbines (WT) compared to onshore WT due to additional loading that arises due to sea current and wave-induced forcing. The effect of wave forcing on the wakes has been one of the important bottlenecks in the design of offshore WT. Though wind energy has matured to a technology, still offshore WT has not been realized in United States yet. To address this concern, there is a strong impetus to advance fundamental understanding of key external factors limiting the wind farms performance. Towards this direction, this project will address the challenges involved in the wake-current-air interactions by using large eddy simulation (LES) as a tool to systematically understand the effect of wave/current amplitude forcing and wind speed on the wake-wake interactions. The objectives of the current study are to determine the hydrodynamic forces due to the wave-current interaction on wind turbines. The PI will develop scaling laws of the mean and turbulence flow in the wake region in terms of dynamic forcing parameters. The scaling laws developed will be compared with the existing wakemodels.The intellectual merit of this study is that it is fundamental in nature as by understanding the interplay of key hydrodynamic and aerodynamic processes affecting the WT, we will be able to lay down the scaling laws of the loss of wind velocity and enhancement of turbulence intensity in terms of the dynamic parameters of wave/current/wind in the wake region. The research is transformative as these scaling laws in the near-wake region of offshore WT will provide, for the first time, accurate parameterization for the existing wake models. The present study will advance the fundamental understanding of the following 3 fundamental aspects in the wake region of offshore WT: (1) Scaling of modified surface roughness, mean velocity deficit and turbulence in the wake region (2) Understanding resonance due to the nonlinear response of the wave energy (3) Isolating the wave-generated turbulence, WT-generated turbulence and turbulence due to wind.The broader impacts of this project are its direct relevance to energy crisis in United States, where there is an urgent need to make wind energy more accessible, and a major source of sustainable form of energy. The results of this study will provide more realistic predictive tools, which will serve as important guidelines for future of offshore wind-farm installations. Specific efforts are being targeted as a part of this proposal to encourage more women to pursue education and careers in engineering.

主要研究者：Bhaganagar，Kiran提案编号：1348480机构：德克萨斯大学圣安东尼奥分校标题：EAGER：理解海上风力涡轮机湍流、水流和波浪相互作用的基本机制与陆上风力涡轮机相比，海上风力涡轮机（WT）中的尾流-尾流相互作用相当大，这是由于海流和波浪引起的强迫产生的额外载荷。波浪强迫对尾流的影响一直是海上WT设计的重要瓶颈之一。虽然风能已经成为一项成熟的技术，但在美国仍然没有实现海上WT。为了解决这一问题，有一个强大的动力，以促进对限制风电场性能的关键外部因素的基本理解。朝着这个方向，本项目将解决的挑战，在尾流-空气相互作用，通过使用大涡模拟（LES）作为一种工具，系统地了解波/电流的振幅强迫和风速的影响尾流相互作用。当前研究的目的是确定由于波浪-水流相互作用对风力涡轮机的水动力。 PI将根据动态强迫参数制定尾流区平均流和湍流的标度律。 这项研究的智慧价值在于，它是基本的，因为通过了解影响WT的关键水动力和空气动力过程的相互作用，我们将能够根据尾流区的波/流/风的动力学参数制定风速损失和湍流强度增强的标度律。这项研究是变革性的，因为海上WT近尾流区域的这些比例律将首次为现有尾流模型提供准确的参数化。本研究将促进对海上WT尾流区以下3个基本方面的基本理解：（1）修正表面粗糙度、尾流区域中的平均速度不足和湍流的标度（2）理解由于波能的非线性响应引起的共振（3）隔离波产生的湍流，该项目的更广泛影响是与美国的能源危机直接相关，美国迫切需要使风能更容易获得，并成为可持续能源的主要来源。本研究的结果将提供更现实的预测工具，这将作为重要的指导方针，为未来的海上风电场安装。作为这项建议的一部分，正在作出具体努力，鼓励更多的妇女接受工程教育和从事工程职业。