Constructive interference effects for tidal turbine arrays
Constructive interference effects for tidal turbine arrays
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潮汐涡轮机阵列的相长干涉效应
DOI：
10.1017/jfm.2022.454
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发表时间：
2022
影响因子：
3.7
通讯作者：
R. Willden
中科院分区：
文献类型：
--
作者：
J. McNaughton;Bowen Cao;A. Nambiar;T. Davey;C. Vogel;R. Willden
摘要利用两台直径为1.2 m的水轮机，通过实验证明了在并排接近的情况下部署潮汐水轮机以利用相长干涉效应的性能优势。涡轮机以1/4直径的叶尖间距并排排列，其性能与单个转子的性能进行比较。测试是在直径25米、水深2米的FloWave海洋能源研究设施中完成的。在不同的控制点的流入条件的详细评估是用来了解转子的影响，设计用于高堵塞的条件下，对接近流。在考虑了全局阻塞后，发现对于涡轮机设计速度，双涡轮机平均功率系数相对于单涡轮机平均功率系数提高了10.8%，而推力系数增加了5.2%，叶尖速比增加了3.1%。流场测绘证明了阵列和设备规模的流动效应，包括阵列旁路流动和涡轮机之间的喷射。叶根挥舞和沿边弯曲力矩的方位角变化表明，涡轮机以有利的方式相互作用，当叶片靠近相邻转子时，具有额外的持续载荷峰值。双涡轮机的峰值性能出现在比单涡轮机更高的叶尖速比处，这与双涡轮机对气流施加更高推力以实现最大功率是一致的。双涡轮机性能随叶尖速比的变化比单涡轮机更为平缓。使用差分转子速度控制，我们观察到，阵列性能是强大的相邻转子工作点的小差异。通过这些实验，我们证明，有一个实质性的，可实现的性能优势，从紧密排列的涡轮机并排运行，并设计它们的建设性干扰。
Abstract The performance benefits of deploying tidal turbines in close side-by-side proximity to exploit constructive interference effects are demonstrated experimentally using two 1.2 m diameter turbines. The turbines are arrayed side-by-side at 1/4 diameter tip-to-tip spacing, and their performance compared with that of a single rotor. Tests were completed in the 25 m diameter, 2 m deep wave and current FloWave Ocean Energy Research facility. A detailed assessment of inflow conditions at different control points is used to understand the impact that rotors, designed for high blockage conditions, have on the approach flow. After accounting for global blockage, a 10.8 % uplift in the twin-turbine-averaged power coefficient, relative to that for a single turbine, is found for the turbine design speed, at the expense of a 5.2 % increase in thrust coefficient and 3.1 % increase in tip-speed-ratio. Flowfield mapping demonstrated flow effects at array and device scale including array bypass flows and jetting between turbines. Azimuthal variation of blade root flapwise and edgewise bending moments show that the turbines interact in a beneficial manner, with additional and sustained loading peaks as the blades pass in close proximity to the neighbouring rotor. Peak performance for the twin turbines occurred at a higher tip-speed-ratio than for the single turbine, which is consistent with the twin turbines exerting a higher thrust on the flow to achieve maximum power. The twin turbine performance variation with tip-speed-ratio is found to be more gradual than for the single turbine. Using differential rotor speed control we observe that array performance is robust to small differences in neighbouring rotor operating point. Through these experiments we demonstrate that there is a substantial, achievable performance benefit from closely arraying turbines for side-by-side operation and designing them for constructive interference.
影响因子：
3.6
作者：
A. Olczak;T. Stallard;T. Feng;P. Stansby
通讯作者：
A. Olczak;T. Stallard;T. Feng;P. Stansby
三叶片水平轴潮汐涡轮机载荷随频率和叶片位置的变化
影响因子：
3.6
作者：
Payne G
通讯作者：
Payne G