Rotational sampling of waves by tidal turbine blades
Rotational sampling of waves by tidal turbine blades
复制标题
潮汐涡轮机叶片对波浪的旋转采样
DOI：
10.1016/j.renene.2020.10.037
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发表时间：
2020
期刊：
影响因子：
8.7
通讯作者：
Draycott S
中科院分区：
文献类型：
--
作者：
Draycott S
波浪的存在使潮汐水轮机承受巨大的循环水动力载荷，这极大地影响了潮汐水轮机叶片的设计要求。在这里，我们描述了一种以前文献中没有考虑过的加载现象，这种现象是由叶片旋转采样振荡和垂直衰减的波致速度场引起的。虽然已隐含地纳入数值模式，但以前并未考虑主要原因和相对影响。本文对这一效应进行了理论分析和实验验证；包括与转子和电流场成角度的不规则波。发现相关载荷与波数密切相关。通过对实验结果的分析，证实了旋转采样效应的本质，在叶片根部弯矩谱中有效地预测了特征边带。据估计，在测试条件下，它占疲劳损伤的8%到16%，占峰值根部弯矩的7%到13%。一个关键的发现是，两个双边对称的斜波条件不会产生等效的加载模式：一个产生更高频率的振荡。此外，发现这些载荷的频率随转速线性降低；强调潮汐流涡轮机运行的另一个考虑因素。
The presence of waves exposes tidal stream turbines to large and cyclic hydrodynamic loads which significantly influence the design requirements for tidal turbine blades. Here we describe a loading phenomenon not previously considered in literature caused as blades rotationally sample an oscillating and vertically decaying wave-induced velocity field. Although implicitly incorporated into numerical models, the dominant causes and relative influence have not previously been considered.In this article this effect is described through theoretical analysis and validated through scaled experiments; including irregular waves at angles to the rotor and current field. The associated loads are found to be strongly correlated to the wavenumber. The nature of the rotational-sampling-effect is confirmed through analysis of the experimental results, where characteristic sidebands are effectively predicted in the blade root bending moment spectra. It is estimated to account for between 8% and 16% of the fatigue damage and between 7% and 13% of the peak root bending moment for the conditions tested. A key finding is that two bilaterally-symmetrical oblique wave conditions do not produce equivalent loading patterns: one produces higher frequency oscillations. Additionally, it is found that the frequency of these loads reduces linearly with rotational speed; highlighting another consideration for tidal stream turbine operation.
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影响因子：
3.2
作者：
S. Ordoñez-Sanchez;Matthew Allmark;Kate Porter;R. Ellis;Catherine Lloyd;I. Santic;T. O’Doherty;C. Johnstone
通讯作者：
S. Ordoñez-Sanchez;Matthew Allmark;Kate Porter;R. Ellis;Catherine Lloyd;I. Santic;T. O’Doherty;C. Johnstone
影响因子：
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作者：
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通讯作者：
I. Milne;A. Day;Rajnish N. Sharma;R. Flay
影响因子：
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作者：
R. Martinez;G. Payne;T. Bruce
通讯作者：
R. Martinez;G. Payne;T. Bruce
使用高能流中的聚焦波群评估潮汐涡轮机的极端负载
影响因子：
8.7
作者：
Draycott S
通讯作者：
Draycott S
海流涡轮机中的波流相互作用
DOI：
10.1243/14750902jeme45
发表时间：
2006
期刊：
Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment
影响因子：
--
作者：
N. Barltrop;K. Varyani;A. Grant;D. Clelland;X. Pham
通讯作者：
X. Pham