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: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=711308
• 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.

流动湍流在太阳能光伏电池板、风力涡轮机、桥梁斜拉索等工程应用中无处不在。尽管对水流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。在发表的无数论文中，特别是最近发表的论文中，许多主要是理论上的，阻碍了这些进步在实际工程系统中的直接利用。实事求是地说，对于太阳能光伏电池板来说，强大的大气风尽管可能对支撑结构构成挑战，但却是冷却太阳能电池板的受欢迎客人，从而提高了能量转换效率。这需要简单、实用、巧妙的方法来操纵这些电池板上的风，以有效地增强热对流。通过由NSERC Discovery提供支持的严格调查，肋条和带状材料已成为有希望的候选材料。在这一追求中，必须努力更好地了解具有适当对流特征的湍流。因此，以实用为导向的基础工程揭示良好的湍流是拟议的发现号的主旨。改善风力机在大气湍流风切变下的性能是第二个实际目标。主要目标是揭示有关均匀风切变过程中的风湍流的细节，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，还探讨了风湍流破坏上游涡轮机进入尾流的有序涡流结构的潜在机制。这一知识对于从工程上缓解尾流对下游多台风力涡轮机的不利影响至关重要。为此，需要更深入地了解气动失速延迟和风湍流对升力的增强。第三个湍流目标是减缓湍流风引起的斜拉索振动。我们最近发现，有害的舞动需要干燥的电缆来回摆动，穿过临界阻力谷。令人困惑的是，风湍流在促进和贬低这种破坏性的干燥电缆驰骋方面扮演着令人困惑的相反角色，这既从根本上耐人寻味，又具有实际意义。