Wake topology and energy recovery in floating horizontal-axis wind turbines with harmonic surge motion
Wake topology and energy recovery in floating horizontal-axis wind turbines with harmonic surge motion
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DOI：
10.1016/j.energy.2022.124907
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发表时间：
2022-08
期刊：
影响因子：
9
通讯作者：
Lei Duan;Q. Sun;Zanyang He;Gen Li
中科院分区：
文献类型：
--
作者：
Lei Duan;Q. Sun;Zanyang He;Gen Li
漂浮式水平轴风力发电机（FHAWT）使我们能够在深水区域收获海上风能。虽然FHAWT的尾流结构会对其自身的气动性能产生二次影响，但尾流特性对FHAWT的性能和浮式风电场的布局都有重要意义，但迄今为止还没有得到充分的了解。为此，进行了参数化数值研究，以研究平台纵荡运动对FHAWT尾流特性的影响。采用改进的延迟分离涡模拟方法（IDDES）对NREL 5 MW风力机涡轮机1/50缩尺模型进行了模拟计算，结果表明，喘振运动对风力机的尾迹结构和能量回收有明显的影响。具体地说，喘振周期是影响FHAWT尾流拓扑结构的主要因素。此外，还首次报道了纵荡运动下涡环结构的独特性。此外，FHAWT的尾流的能量回收主要取决于浪涌周期，并且可能比固定底部的风力发电机在不同的位置更快或更慢，这表明在浮式风电场中两个相邻的FHAWT之间的间隔应根据主导或非主导风向仔细考虑。
Floating horizontal-axis wind turbines (FHAWTs) enable us to harvest offshore wind energy in deep water area. Although the wake structure of an FHAWT causes secondary effects on its own aerodynamic performance, the wake characteristics are significant in both the performance of rear FHAWTs and the layout of floating wind farms, however, not sufficiently understood so far. To this end, a parametric numerical study is conducted to investigate the FHAWT's wake characteristics influenced by platform's surge motion. An improved delayed detached eddy simulation (IDDES) is applied on a 1/50 scale rotor of NREL 5 MW wind turbine, showing that surge motion evidently influences FHAWT's wake structure, as well as its' energy recovery. Specifically, the surge period is the predominant factor that influences FHAWT's wake topology. In addition, the unique vortex ring structures in the wake of the FHAWT under surge motion is reported for the first time. Moreover, the energy recovery of the FHAWT's wake depends on the surge period principally, and may be faster or slower than that of fixed-bottom wind turbines at different positions, indicating that the interval between two adjacent FHAWTs in floating wind farms should be considered carefully depending on prevailing or unprevailing wind directions.