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The effect of surface waves on the performance characteristics of a model tidal turbine

机译：表面波对潮汐涡轮机性能特性的影响

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Scale model tests were conducted on a three bladed horizontal axis tidal turbine in a large tow tank facility at the United States Naval Academy. Performance characteristics are presented for a turbine towed at a constant carriage speed for cases with and without surface waves. Intermediate waves were modeled that are representative of swells typically found on the continental shelf of the United States eastern seaboard. The oscillatory wave velocity present in the water column results in significant variations in measured turbine torque and rotational speed as a function of wave phase. This in turn produces cyclic variations in tip speed ratio and power coefficient. The power coefficient over the entire wave phase did not show a difference from the experiments without waves for a range of tip speed ratios, as reported in previous studies. The waves limited the lower range of tip speed ratios at which the turbine could operate. These results highlight the impact of surface waves on turbine design and performance, and the importance of understanding the site-specific wave conditions.
机译：比例模型测试是在美国海军学院大型拖船设施中的三叶片水平轴潮汐涡轮机上进行的。给出了具有和没有表面波的情况下以恒定的托架速度牵引的涡轮机的性能特征。模拟了代表美国东部沿海大陆架上通常出现的隆起的中间波浪。在水柱中存在的振荡波速导致测得的涡轮转矩和转速作为波相位的函数发生显着变化。反过来，这会导致叶尖速比和功率系数发生周期性变化。如先前研究报道，在整个波相位上，功率系数与无波速实验在一定范围的叶尖速比之间没有差异。这些波限制了涡轮可工作的叶尖速比的较低范围。这些结果突显了表面波对涡轮设计和性能的影响，以及了解特定地点的波情况的重要性。

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