Creative Turbulence for Improving Energy Efficiency and Engineering Safety

湍流在许多工程应用中无处不在，包括太阳能光伏板、风力涡轮机和桥梁拉索。尽管对湍流进行了世纪的深入研究，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，阻碍了在实际工程系统中直接利用这些进展。实际上，对于太阳能光伏面板，强大气风，即使其可能对支撑结构是挑战，也是用于冷却面板的受欢迎的客人，并且因此提高能量转换效率。这需要简单，实用，巧妙的方法来操纵这些面板上的风，以有效地增加热对流。通过NSERC Discovery的严格调查，肋骨和丝带已经成为有希望的候选人。在这一过程中，必须努力更好地理解具有适当对流特征的湍流。因此，面向实际的，基本的工程发现良好的湍流是所提出的发现的主旨。第二个实际目标是改善大气湍流风切变下的风力涡轮机性能。主要目标是挖掘出有关风切变中的风湍流的细节，以及由此产生的对风力涡轮机性能的主要建设性影响。此外，在破坏来自上游涡轮机的进入尾流的良好组织的涡流结构中，寻求风湍流中所涉及的基本机制。这方面的知识是至关重要的工程缓解的不利影响，多个风力涡轮机下游的尾流。为此，需要改进对气动失速延迟和风湍流增升的认识。第三个湍流目标是减轻湍流风引起的斜拉索振动。我们最近发现，有害的舞动需要来回摆动的干电缆跨越临界阻力谷。令人困惑的相反的作用，风湍流在促进和然而，降级这种破坏性的干电缆舞动是既从根本上耐人寻味，实际上是重要的。

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.