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

潮汐能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，大多数初步模型只考虑剪切剖面和湍流作为主要流动条件。在IEC的设计过程中，波浪对流动条件的重要性是确定的，然而大多数规范都强调稳态载荷。正如一些研究提出的那样，涡轮机的存在改变了波浪的高度和长度，这可能表明，当整个阵列被放置时，如何将其指数化，以及邻近的涡轮机如何经历完全不同的负载情况。由于平均涡轮性能显示不受这些动载荷的影响，也许有必要研究这些包络载荷情况的长期影响。博士项目的目标是：(1)利用即将开发的流固耦合多物理场有限元模型，准确地描述潮汐叶片的压力分布，并比较这些压力分布对离散点加载时叶片弯曲的影响；(2)通过开发误差最小化工具，开发新的方法，使离散加载能够最紧密地匹配流体动力加载；基于静态和循环叶片加载的力传递机制2和(4)基于上述1-3为FASTBLADE提供加载和设计建议。

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.