Performance of non-uniform tidal turbine arrays in uniform flow
Performance of non-uniform tidal turbine arrays in uniform flow
复制标题
非均匀潮汐涡轮机阵列在均匀流中的性能
DOI：
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发表时间：
2018
影响因子：
1.9
通讯作者：
A. Borthwick
中科院分区：
文献类型：
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作者：
P. A. J. Bonar;T. Adcock;V. Venugopal;A. Borthwick
理论模型表明，为了最大限度地提高其集体功率输出，潮汐涡轮机应安排在一个单一的横流行和最佳间隔，以利用局部阻塞效应。然而，由于假设这些阵列中的涡轮机是相同的，因此这些模型没有考虑通过利用局部阻塞和阻力的展向变化来提高发电量的可能性。在本文中，我们使用深度平均的数值模拟研究是否可以通过改变单独的局部堵塞，单独的局部阻力，或局部堵塞和阻力一起，跨阵列宽度的潮汐涡轮机阵列的性能进一步提高。我们的研究结果表明，对于一个初始均匀的流场，最佳的潮汐涡轮机阵列也是均匀的，也就是说，它包括相同的尺寸，间距和阻力的涡轮机。这一发现是令人鼓舞的，因为将每个涡轮机设计成相同的并以相同的方式操作，成本效益更高，而且简单得多。与早期的研究结果一起，这些结果还提出了一个更普遍的，也许并不令人惊讶的结论，即潮汐涡轮机阵列在设计时最好匹配特定场地的自然流动条件。
Theoretical models suggest that in order to maximise their collective power output, tidal turbines should be arranged in a single cross-stream row and optimally spaced to exploit local blockage effects. However, because it is assumed that the turbines within these arrays are identical, such models do not consider the possibility of enhanced power production through the exploitation of spanwise variations in local blockage and resistance. In this paper, we use depth-averaged numerical simulations to investigate whether the performance of a tidal turbine array can be further enhanced by varying solely the local blockage, solely the local resistance, or both local blockage and resistance together, across the array width. Our results suggest that for an initially uniform flow field, the optimal tidal turbine array is also uniform, that is to say that it comprises turbines of equal size, spacing, and resistance. This finding is encouraging because it is more cost-effective and much simpler to design each turbine to be the same and to operate in the same way. Together with earlier findings, these results also suggest a more general, and perhaps unsurprising, conclusion that tidal turbine arrays perform best when designed to match site-specific natural flow conditions.