Maximising energy capture by fixed orientation tidal stream turbines in time-varying off axis current
Maximising energy capture by fixed orientation tidal stream turbines in time-varying off axis current
复制标题
通过固定方向潮汐流涡轮机在时变离轴流中最大化能量捕获
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
C. Stevens
中科院分区：
文献类型：
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作者：
T. Divett;R. Vennell;C. Stevens
潮汐流发电正处于萌芽状态，对固定方向装置进行了一些测试部署，这些装置比其他可以自由被动旋转到瞬时最大电流方向的涡轮机更简单，也可能更可靠。这些固定方向设备非常适合双向流动。然而，在大量能源集中的大型潮汐海峡中，潮汐流通常是一个平均分量和多个潮汐椭圆分量的复杂混合。例如，在每个潮汐周期中在岬角后面形成的涡流可以在潮汐海峡中的岬角周围产生高次谐波潮汐成分。这项理论研究通过计算固定方向涡轮机可以从由平均分量和潮汐椭圆分量组成的合成流中捕获的最大能量，研究固定方向涡轮机从偏离严格双向流的流中捕获能量的潜力。固定方向潮汐流涡轮机无法捕获可自由旋转到瞬时最大水流的涡轮机可用的总能量的很大一部分，并且进入流动的方向角度很大。
Tidal stream electricity generation is embryonic with a few test deployments of fixed orientation devices which are simpler and potentially more reliable than other turbines which are free to rotate passively into the direction of instantaneous maximum current. These fixed orientation devices ideally suit bi-directional flow. However, tidal flow in large tidal straits, where large energy resources are focused, is usually a complex mix of a mean component and several tidal ellipse components. For example eddies formed behind headlands on each tidal cycle can result in higher harmonic tidal constituents around a headland in a tidal strait. This theoretical study investigates the potential of fixed orientation turbines to capture the energy from flows that deviate from strictly bi-directional flow by calculating the maximum energy that can be captured by a fixed orientation turbine from synthetic flows composed of a mean component and tidal ellipse components. Fixed orientation tidal stream turbines miss out on capturing a significant proportion of the total energy that is available to turbines that are free to rotate into the instantaneous maximum current and the angle of orientation into the flow is significant.