Nonlinear analysis of flow-induced instabilities of wind turbine blades using theoretical models and supported by experimental data

使用理论模型和实验数据支持的风力涡轮机叶片流引起的不稳定性的非线性分析

• 批准号: 1437988
• 负责人: Yahya Modarres-Sadeghi
• 金额: $ 27.26万
• 依托单位: University of Massachusetts Amherst
• 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 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1437988&HistoricalAwards=false
• 关键词: Nonlinear; analysis; flow; induced; instabilities

Principal Investigator: Yahya Modarres-SadeghiNumber: 1437988 Title: Nonlinear analysis of flow-induced instabilities of wind turbine blades using theoretical models and supported by experimental dataInstitution: University of Massachusetts, AmherstIncreasingly, wind farms for the production electricity are being sited off shore to harvest this renewable energy resource. The available energy that individual wind turbines within the wind farm may extract is proportional to the swept area of the turbine rotor blades, creating a powerful incentive to design, manufacture, and commercially use longer and more slender blades. This trend is driven by economics - wind farm installation costs are substantially higher offshore than onshore, and so increased energy production per installed wind turbine is crucial for cost-effective offshore wind energy. However, as blades become longer and more slender, they become more susceptible to various flow induced instabilities. A particularly troublesome instability is the unwanted blade oscillations, or flutter, caused by the interaction of the blade with the wind. This unstable behavior can lead to catastrophic failure of the blades. This limitation poses a threat to the integrity of offshore wind turbines and their ability to reliably operate. In the current research, flow-induced instabilities of wind turbine blades will be studied using advanced computational models based on a technique called nonlinear analysis in order to better understand these instabilities and develop guidelines for the design of future wind turbine blades. As part of the proposed activities, the principal investigator will organize a session at the North American Wind Energy Academy (NAWEA) on Offshore Wind Energy, develop YouTube presentations on wind turbines targeted to middle and high school students, and give demonstrations to local high school students on the same topic. Technical DescriptionThe goal of this research is to develop a nonlinear, fully-coupled continuous fluid-structure interaction model for flexible and rotating wind turbine blades. This model will be used to study flow-induced instabilities for long and slender blades that are anticipated to be used in future shore wind turbines. A wind turbine blade is an inherently three-dimensional and nonlinear system. Nevertheless, current approaches for wind turbine blade instability analysis have modeled the blades as two-dimensional, linear systems in order to bypass the difficulties associated with three-dimensional, nonlinear system modeling. However, as blades become longer and more slender, the need for more comprehensive models is necessary. The proposed nonlinear model for flexible and rotating blades will account for varying blade shapes and cross-sections, as well as bending and torsional properties. Geometric, flow-related and fluid-structure interaction nonlinearities will be embedded into the model. A comprehensive series of wind tunnel experiments will be conducted to validate this model. The validated model will then be used to provide a fundamental understanding of flow-induced instabilities of wind turbine blades. This approach will also enable the study of nonlinear instability of flexible structures with non-uniform properties along their length under highly nonlinear interaction with flow, and thus provide a broader understanding of the physics underlying nonlinear fluid-structure interaction systems. With respect to education and broader impacts, the principal investigator will organize a session at the North American Wind Energy Academy (NAWEA) on Offshore Wind Energy. Outreach activities include development of YouTube presentations on wind turbines targeted to middle and high school students, and demonstrations to local high school students on the same topic.

首席研究员：Yahya Modarres-Sadeghinumber：1437988标题：使用理论模型对风力涡轮机叶片的不稳定性的非线性分析，并得到实验数据史蒂特的支持：马萨诸塞州大学，阿米尔斯坦大学，风场，生产电力为shore shore of Shore of Shore of shore of shore of shore of shore of shore of shore of shore of shore of shore oft of shore of shore。风电场中各个风力涡轮机的可用能量可能与涡轮转子叶片的扫掠区成正比，从而产生了强大的激励措施，以设计，制造和商业使用更长，更细长的叶片。这种趋势是由经济学驱动的 - 风电场安装成本大大高于陆上，因此每个安装的风力涡轮机的能源产量增加对于成本效益的离岸风能至关重要。 但是，随着叶片变得更长，更苗条，它们变得越来越容易受到各种流动引起的不稳定性的影响。一个特别麻烦的不稳定是由于刀片与风的相互作用引起的不良刀片振荡或颤动。 这种不稳定的行为会导致叶片的灾难性失败。 这种限制对离岸风力涡轮机的完整性及其可靠运行的能力构成威胁。在当前的研究中，将使用基于一种称为非线性分析的技术的高级计算模型来研究风力涡轮机叶片的流动诱导的不稳定性，以便更好地了解这些不稳定性并制定针对未来风力涡轮机叶片设计的指南。 作为拟议活动的一部分，首席调查员将在北美风能学院（NAWEA）在海上风能组织一次会议，在针对中学生和高中生的风力涡轮机上开发YouTube演讲，并向当地的高中生举行有关同一主题的示范。技术描述这项研究的目的是为柔性和旋转的风力涡轮机叶片开发非线性，完全耦合的连续流体结构相互作用模型。 该模型将用于研究长而细长的叶片的流动引起的不稳定性，预计将在未来的海岸风力涡轮机中使用。 风力涡轮刀片是固有的三维和非线性系统。然而，当前的风力涡轮机叶片不稳定性分析方法已将叶片建模为二维线性系统，以绕过与三维非线性系统建模相关的困难。 但是，随着叶片变得更长，更苗条，需要对更全面的模型的需求。 提出的用于柔性和旋转叶片的非线性模型将解释不同的叶片形状和横截面，以及弯曲和扭转特性。 几何，流动相关和流体结构的相互作用非线性将嵌入到模型中。 将进行一系列全面的风洞实验，以验证该模型。 然后，经过验证的模型将用于提供对风力涡轮叶片流动诱导的不稳定性的基本理解。 这种方法还将能够研究在高度非线性与流动的相互作用下，沿其长度沿其长度不均匀的柔性结构的非线性不稳定性研究，从而更广泛地了解非线性非线性流体结构相互作用系统。 关于教育和更广泛的影响，首席研究员将在北美风能学院（NAWEA）组织一次会议，以近海风能组织。 外展活动包括开发针对初中学生和高中学生的风力涡轮机的YouTube演讲，以及向当地高中生的同一主题进行示范。

项目成果

Clean, green, and just? Community perspectives on the renewable energy transition in a New England city

清洁、绿色、公正？

• DOI: 10.1016/j.sctalk.2023.100188
• 发表时间: 2023
• 期刊: Science Talks
• 作者: Harper, Krista;Bates, Alison;Nwadiaru, Ogechi Vivian;Cantor, Julia;Cowan, Makaylah;Shokooh, Marina Pineda
• 通讯作者: Shokooh, Marina Pineda