The effects of oblique waves and currents on the loadings and performance of tidal turbines
The effects of oblique waves and currents on the loadings and performance of tidal turbines
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DOI：
10.1016/j.oceaneng.2018.05.057
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发表时间：
2018-09
影响因子：
5
通讯作者：
R. Martinez;G. Payne;T. Bruce
中科院分区：
文献类型：
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作者：
R. Martinez;G. Payne;T. Bruce
潮汐能开发处于早期部署阶段，需要降低成本，以提高该部门的长期经济可行性。潮汐涡轮机的高成本部分是由于负载的不确定性，这导致在设计中使用高安全系数以确保生存。不确定性的最重要原因之一是流体动力载荷。到目前为止，大多数水平轴水轮机的比例模型实验都是在波浪和水流方向共线的情况下进行的。据作者所知，本文所介绍的工作是第一次实验研究的水平轴涡轮机模型受到组合斜波和流。涡轮机性能和负载是在英国爱丁堡大学的FloWave圆形波浪和水流组合水池中测试的1：15比例模型的测量结果。三个不同的流动方向进行了测试，他们中的每一个也结合了规则波在三个不同的方向不共线的流动。测量了15个物理量，包括流速、转子和基础载荷以及涡轮机转速。介绍了斜流和波浪条件下的负荷特性和涡轮机性能。波浪影响转子功率和推力的平均值和标准偏差，但离轴波浪与比迎面波浪低的推力载荷相关。与仅电流相比，转子扭矩和推力标准偏差在存在波浪的情况下更高，并且当波峰平行于转子平面时几乎是两倍高。与本文相关的实验数据可以从http://dx.doi.org/10.7488/ds/2360下载。
Tidal energy exploitation is at an early deployment stage and costs need to be reduced to improve the long term economic viability of the sector. High costs of tidal turbines are, in part, the result of load uncertainties, which lead to the use of high factors of safety in the design to ensure survival. One of the most important causes of uncertainty is hydrodynamic loadings. To date, most of the scaled model experiments with horizontal axis turbines investigating this issue have been carried out with collinear wave and current directions. To the authors' knowledge, the work presented herein is the first experimental investigation of a horizontal axis turbine model subjected to combined oblique waves and current. Turbine performance and loading are measured for a 1:15 scale model tested in the FloWave circular, combined wave and current basin at the University of Edinburgh (UK). Three different flow directions were tested and each of them were also combined with regular waves in three different directions non-collinear with the flow. Fifteen physical quantities were measured including flow velocity, rotor and foundation loads and turbine speed. Characterisation of loads and turbine performance in those oblique current and wave conditions are presented. Waves affect means and standard deviation of rotor power and thrust, but off-axis waves are associated with lower thrust loads than head-on waves. Compared to current only, rotor torque and thrust standard deviations are higher in the presence of waves and almost twice as high when the wave crest is parallel to the rotor plan. The experimental data associated with this article can be downloaded from http://dx.doi.org/10.7488/ds/2360.