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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638824
• 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.

流动湍流在许多工程应用中无所不在，包括太阳能光伏面板，风力涡轮机和桥梁式电缆。尽管有一个多世纪的有关流动性湍流的深入研究，但对这种“神秘生物”的全面理解仍然难以捉摸。在发表的无数论文中，尤其是最近的论文中，许多论文在很大程度上是理论上的，这阻碍了对实践工程系统中这些进步的直接剥削。务实地，对于太阳能光伏面板而言，强烈的大气风，即使这可能对支撑结构是一个挑战，也是宾客冷却面板的欢迎，从而提高了能量转换效率。这需要简单，实用，巧妙的手段来操纵这些面板上的风以有效增加热量转换。通过由NSERC发现驱动的严格调查，肋骨和缎带已成为应许的候选人。在这种追求中，必须更好地了解具有适当对流特征的动荡流的努力。这是拟议发现的实际上是面向良好的良好动荡的基本工程。在大气中的湍流风剪下改善风力涡轮机的性能是第二个实用目标。主要目标是发掘有关风剪切均匀的风湍流的细节，并在很大程度上对风力涡轮机性能产生的建设性影响。此外，感受到了从上游涡轮机分解传入尾流的井井有条的涡流流结构中，涉及风湍流的基本机制。这些知识对于缓解尾流对多个风力涡轮机的不利影响的工程至关重要。为此，需要改善对空气动力学摊位延迟的见解，并通过风湍流提升。第三个湍流目标是减轻湍流风引起的停留电缆振动。我们最近发现，干燥的电缆穿过关键的拖车谷所需的疾驰而来。风湍流在促进中的相对角色令人困惑，然而，降级这款破坏性的干缆罐装在根本上是有趣的，而且实际上很重要。