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Numerical models to predict the performance of tidal stream turbines working under off-design conditions

机译：数值模型预测潮汐涡轮机在非设计条件下的性能

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摘要

As previously experienced by the wind industry, it is envisaged that tidal stream turbine blades will present misalignments or blade deformations over time as they are constantly working under harsh and highly unsteady environments. Blade misalignment will affect the power capture of a tidal stream turbine and if not detected in time could affect other components of the drive train. Therefore, the aim of this paper is to compare the use of two numerical modelling techniques to predict the performance of a tidal stream turbine working under off-design conditions, in this case, the misalignment of one or more blades. The techniques used in this study are Blade Element Momentum Theory and Computational Fluid Dynamics. The numerical models simulate the performance of a three-bladed horizontal axis tidal stream turbine with one or two blades offset from the optimum pitch setting. The simulations were undertaken at 1.0 m/s flow speeds. The results demonstrated that both unsteady BEMT and steady or transient CFD are able to predict power coefficients when there is a certain level of misalignment in one or even two blades. However, both techniques failed to accurately predict a loss of power performance at high rotational speeds.
机译：正如风能行业以前所经历的那样，可以预见，随着时间流逝，潮汐流涡轮机叶片会在恶劣和高度不稳定的环境中持续工作，因此它们会随时间推移出现偏移或叶片变形。叶片未对准会影响潮流涡轮机的功率捕获，如果未及时检测到，则会影响传动系统的其他组件。因此，本文的目的是比较两种数值建模技术的使用情况，以预测在非设计条件下工作的潮汐流涡轮机的性能，在这种情况下，这是一个或多个叶片未对准的情况。在这项研究中使用的技术是叶片元素动量理论和计算流体动力学。数值模型模拟了三叶片水平轴潮汐流涡轮机的性能，其中一或两个叶片偏离了最佳螺距设置。模拟以1.0 m / s的流速进行。结果表明，当一个或什至两个叶片存在一定程度的失准时，非稳态BEMT和稳态或瞬态CFD都能够预测功率系数。但是，两种技术都无法准确预测高转速下的动力性能损失。

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