Creative Turbulence for Improving Energy Efficiency and Engineering Safety

提高能源效率和工程安全的创造性湍流

• 批准号: RGPIN-2017-04947
• 负责人: Ting, David
• 金额: $ 2.26万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=683797
• 关键词: Creative; Turbulence; Improving; Energy; Efficiency

Flow turbulence is omnipresent in many engineering applications including solar photovoltaic panels, wind turbines, and bridge stay cables. Despite more than a century of intensive research on flow turbulence, a comprehensive understanding of this mysterious creature' remains elusive. Among the myriad of papers published, especially the more recent ones, many are largely theoretical, hindering the direct exploitation of these advances in practical engineering systems. Pragmatically, to a solar photovoltaic panel, strong atmospheric wind, even though it may be a challenge to the supporting structures, is a welcome guest for cooling the panel and thus, improves the energy conversion efficiency. This calls for simple, functional, ingenious means to manipulate the wind over these panels to effectively augment heat convection. Through rigorous investigations powered by NSERC Discovery, ribs and ribbons have emerged as promising candidates. On this pursuit, the endeavour to better understanding of the turbulent flow with the proper convective features is a must. Thus, the practically oriented, fundamental engineering uncovering of good turbulence is the thrust of the proposed Discovery. Improving wind turbine performance under atmospheric turbulent wind shear is the second practical objective. The primary goal is to unearth the details concerning the wind turbulence in homogenizing the wind shear, and the resulting largely constructive effect on the performance of the wind turbine. Furthermore, the underlying mechanisms involved in wind turbulence in breaking down the well-organized, vortical flow structures of the incoming wake from an upstream turbine are sought. This knowledge is critical to engineering mitigation of the adverse effects of the wake on multiple wind turbines downstream. To this end, improved insights on the aerodynamic stall delay and lift enhancement by wind turbulence are needed. The third turbulence objective is alleviation of turbulent wind induced stay cable vibrations. We recently discovered that detrimental galloping necessitates the to and fro swinging of the dry cable across the critical drag valley. The perplexing opposing role of wind turbulence in promoting and yet, demoting this damaging dry cable galloping is both fundamentally intriguing and practically important.

湍流在许多工程应用中无处不在，包括太阳能光伏板、风力涡轮机和桥梁斜拉索。尽管对流动湍流进行了一个多世纪的深入研究，但对这种神秘生物的全面了解仍然难以捉摸。在已发表的无数论文中，特别是最近发表的论文，许多主要是理论性的，阻碍了这些进步在实际工程系统中的直接利用。实际上，对于太阳能光伏板来说，强烈的大气风虽然可能对支撑结构构成挑战，但对于冷却面板来说却是一个受欢迎的客人，从而提高了能量转换效率。这需要一种简单、实用、巧妙的方法来操纵这些面板上的风，以有效地增强热对流。通过NSERC Discovery提供的严格调查，肋骨和带状已经成为有希望的候选。在这种追求中，必须努力更好地理解具有适当对流特征的湍流。因此，以实际为导向的，对良好湍流的基本工程发现是提出的发现的推动力。提高风力机在大气湍流风切变下的性能是第二个实际目标。主要目标是揭示风切变均匀化过程中风湍流的细节，以及由此产生的对风力机性能的主要建设性影响。此外，还寻求了风湍流在破坏上游涡轮进入尾流的组织良好的旋涡流结构时所涉及的潜在机制。这一知识对于减轻尾流对下游多个风力涡轮机的不利影响至关重要。为此，需要改进对气动失速延迟和风湍流增强升力的认识。第三个湍流目标是缓解湍流风引起的斜拉索振动。我们最近发现，有害的飞奔需要在临界阻力谷上来回摆动干缆。风湍流在促进和降低这种破坏性的干缆疾速方面发挥着令人困惑的相反作用，这既从根本上引人入胜，又具有实际意义。