Unsteady hydrodynamics of tidal turbine blades
Unsteady hydrodynamics of tidal turbine blades
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DOI：
10.1016/j.renene.2019.06.153
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发表时间：
2020-02
期刊：
影响因子：
8.7
通讯作者：
Gabriel Thomas Scarlett;I. M. Viola
中科院分区：
文献类型：
--
作者：
Gabriel Thomas Scarlett;I. M. Viola
潮汐涡轮机会遇到一系列不稳定的流动条件，其中一些可能会引起严重的负荷波动。转子叶片会出现失速延迟、载荷滞后和动态失速。然而，引起全尺寸轴流式涡轮这些影响的流动条件的范围尚不清楚。在这项工作中，我们通过模拟根部弯矩响应，在一系列流动条件下进行参数研究。我们展示了沿叶片跨度的非定常表现，发生的非定常现象以及引起最显著负载波动的条件。我们发现波浪和湍流是不稳定的主要来源，极端的波浪比极端的湍流占主导地位。偏航偏差增加了负载波动，但降低了最大峰值。大的偏航角、低的叶尖速比和非常大的波浪导致动态失速，增加了平均载荷。相反，增加的质量效应大多会减弱载荷。
Tidal turbines encounter a range of unsteady flow conditions, some of which may induce severe load fluctuations. Rotor blades can experience stall delay, load hysteresis and dynamic stall. Yet, the range of flow conditions which cause these effects for a full-scale axial-flow turbine are unclear. In this work we carry out a parameter study across a range of flow conditions by modelling root bending moment responses. We show how unsteadiness manifests along the span of the blade, the unsteady phenomena occurring and the conditions which induce the most significant load fluctuations. We find that waves and turbulence are the main sources of unsteadiness, and that extreme waves dominate over extreme turbulence. A yaw misalignment increases the load fluctuations but reduces the maximum peak. Large yaw angles, low tip-speed ratios, and very large waves lead to dynamic stall increasing the mean loads. Conversely, added mass effects mostly attenuate the loadings.