Unsteady hydrodynamics of a full-scale tidal turbine operating in large wave conditions
Unsteady hydrodynamics of a full-scale tidal turbine operating in large wave conditions
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大波浪条件下运行的全尺寸潮汐涡轮机的非定常流体动力学
DOI:
10.1016/j.renene.2019.04.123
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发表时间:
2019
期刊:
影响因子:
8.7
通讯作者:
Scarlett G
中科院分区:
文献类型:
--
作者:
Scarlett G
Tidal turbines operate in a highly unsteady environment, which causes large-amplitude load fluctuations to the rotor. This can result in dynamic and fatigue failures. Hence, it is critical that the unsteady loads are accurately predicted. A rotor's blade can experience stall delay, load hysteresis and dynamic stall. Yet, the significance of these effects for a full-scale axial-flow turbine are unclear. To investigate, we develop a simple model for the unsteady hydrodynamics of the rotor and consider field measurements of the onset flow. We find that when the rotor operates in large, yet realistic wave conditions, that the load cycle is governed by the waves, and the power and blade bending moments oscillate by half of their mean values. While the flow remains attached near the blade tip, dynamic stall occurs near the blade root, resulting in a twofold overshoot of the local lift coefficient compared to the static value. At the optimal tip-speed ratio, the difference between the unsteady loads computed with our model and a simple quasi-steady approximation is small. However, below the optimal tip-speed ratio, dynamic stall may occur over most of the blade, and the maximum peak loads can be twice those predicted with a quasi-steady approximation.
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DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
W. Sheng;R. Galbraith;F. Coton
通讯作者:
F. Coton
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
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通讯作者:
I. M. Viola
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
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J. Janiszewska;R. R. Ramsay;M. Hoffmann;G. Gregorek
通讯作者:
G. Gregorek
影响因子:
5
作者:
I. Milne;A. Day;Rajnish N. Sharma;R. Flay
通讯作者:
I. Milne;A. Day;Rajnish N. Sharma;R. Flay
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
W. Sheng;R. Galbraith;F. Coton
通讯作者:
F. Coton