Effects of free surface on a flapping-foil based ocean current energy extractor
Effects of free surface on a flapping-foil based ocean current energy extractor
复制标题
自由表面对基于扑翼的洋流能量提取器的影响
DOI：
10.1016/j.renene.2021.09.098
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发表时间：
2022-01
期刊：
影响因子：
8.7
通讯作者：
Lubao Teng
中科院分区：
文献类型：
--
作者：
Jian Deng;Shuhong Wang;Prabal K;el;Lubao Teng
数值研究了自由液面对基于扑翼的海流能量提取器的影响。考虑了NACA 0015翼型在雷诺数为900，佛汝德数在0 ~ 2之间变化时，在俯仰和垂荡耦合运动下的二维翼型。我们将无量纲频率固定为f θ = 0.16，俯仰振幅固定为θ0= 75°。以往的研究表明，在这些特定的参数下，单相流体流动中的能量提取效率可达到0.30。在目前的研究中，作为自由表面的考虑，我们报告的淹没深度和弗劳德数影响能量提取效率。当水深从H = 1增加到H = 20时，对于所有考虑的弗劳德数，效率最终收敛到33.7%，尽管当水深和弗劳德数都很小时，可以观察到略高的效率。在固定的淹没深度下，效率随着弗劳德数的增加而单调下降，当深度较小时，即，箔片非常靠近自由表面。显然，自由表面在能量收集效率中起着不利的作用，因此，翼片应部署在离自由表面足够大的距离处，特别是当它在高弗劳德数下工作时。
We study numerically the effects of free surface on a flapping-foil based ocean current energy extractor. A two-dimensional NACA0015 foil, subjected to a coupled pitching and heaving motions, at a fixed Reynolds number of 900, and varied Froude numbers between 0 and 2, is considered. We fix the non-dimensional frequency atf∗ = 0.16 and pitching amplitude atθ0= 75°. The previous studies suggested that an energy extracting efficiency up to 0.30 could be achieved in a single-phase fluid flow at these specific parameters. In the current study, as the free surface is considered, we report that both the submergence depth and Froude number affect the energy extracting efficiency. As the submergence depth increases fromH= 1 toH= 20, for all the Froude numbers considered, the efficiency converges eventually to 33.7%, though slightly higher efficiencies can be observed when both the depth and Froude number are small. At a fixed submergence depth, the efficiency decreases monotonically with the increasing Froude number, which trend is more pronounced when the depth is small, i.e., the foil is very close to the free surface. It is apparently suggested that the free surface plays an unfavorable role in the energy harvesting efficiency, therefore the foil should be deployed with a sufficiently large distance from the free surface, particularly when it operates at high Froude numbers.
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影响因子：
3.6
作者：
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通讯作者：
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影响因子：
9
作者：
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影响因子：
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作者：
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DOI：
10.2514/6.2005-5117
发表时间：
2005-06
期刊：
--
影响因子：
--
作者：
R. Noack
通讯作者：
R. Noack
影响因子：
3.6
作者：
Jean-Christophe Veilleux;G. Dumas
通讯作者：
Jean-Christophe Veilleux;G. Dumas