Fatigue Effects in Composite Tidal Turbine Blades caused by Discrete Point Loading during Service

潮流水轮机经历了一系列的水动力效应载荷，驱动叶片弯矩疲劳考虑。然而，大多数初步模型只将剪切剖面和湍流作为主要的流动条件。在IEC的设计过程中，波浪对水流条件的重要性是决定性的，但大多数规范都强调稳态载荷。一些研究表明，涡轮机的存在改变了波浪的高度和长度，这可能表明，当放置整个阵列时，这可能会被指数化，以及相邻的涡轮机可能会经历完全不同的负载情况。由于平均涡轮性能不受这些动态载荷的影响，也许有必要研究这些包络载荷情况的长期影响。PHD项目的目标是(1)准确地描绘出潮汐叶片上的压力分布，并使用即将开发的流固耦合多物理有限元模型比较这些压力分布对叶片弯曲的影响。(2)开发新的方法，通过开发误差最小化工具，使离散载荷能够最接近地匹配水动力载荷。(3)设计新颖的、可测试的、对于静态和循环叶片加载，基于2的力传递机制和(4)提供基于上述1-3的FASTBLADE的加载和设计建议。

Tidal stream turbines experience a range of hydrodynamic effects loads which drive the blade bending moment fatigue consideration. However, most preliminary models consider only the shear profile and turbulence as the predominant flow conditions. The importance of waves on the flow conditions is determinant in the design process by the IEC, however most of specifications make an emphasis on steady state loading. The presence of a turbine alters the height and length of waves as some studies propose, which might suggest how this can be exponentiated when a whole array is placed and how neighbouring turbines might experience completely different load cases. As the mean turbine performance shows to be unaffected by these dynamic loads, perhaps it is necessary to study the long-term effects of these envelope load cases.The objectives of the PhD project are (1) to accurately profile pressure distributions across tidal blades and compare the effect these have on blade bending against discrete point loading using coupled fluid-solid multiphysics finite element models that will be developed (2) develop novel methods by which means discrete loading can most closely match hydrodynamic loading by developing error minimisation tools (3) design novel, testable, force transfer mechanisms based on 2 for both static and cyclic blade loading and (4) provide loading and design recommendations for FASTBLADE based on 1-3 above.