CFD Simulations on Interference Effects between Offshore Wind Turbines
CFD Simulations on Interference Effects between Offshore Wind Turbines
复制标题
海上风力发电机间干扰效应的 CFD 模拟
DOI：
10.1088/1742-6596/524/1/012143
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
P. Weihing
中科院分区：
文献类型：
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作者：
P. Weihing
本文介绍了位于德国Alpha Ventus风电场的两台5 MW风力涡轮机的详细三维CFD模拟结果，这两台风力涡轮机在半尾流条件下位于彼此后面。本研究关注的焦点是尾流-涡轮机相互作用，以得出主要的阴影效应及其对下游涡轮机叶片载荷和功率响应的影响。为此，使用来自DLR（德国航空航天中心）的流动求解器FLOWer进行分离涡模拟（DES）。为了考虑所有相关的空气动力学效应，主要涡轮机部件被表示为具有解析边界层的直接模型。基于测量的湍流入流条件被规定为现实地考虑大气边界层。为了分析下游涡轮机前的流动条件，对尾流传播和速度谱进行了评估，并与未扰动的大气边界层进行了比较。通过与上游涡轮机进行比较，讨论了它们对负荷和发电量的影响及其相应的波动。结果发现，下游涡轮机在半尾流条件下出现的疲劳载荷明显更高，因为叶片载荷波动被上游涡轮机的非定常尾流高度放大。
This paper presents results of detailed 3D CFD simulations of two 5MW wind turbines sited in the German wind farm Alpha Ventus which are located behind each other at half-wake conditions. The focus of interest in this study is put on wake – turbine interaction, in order to derive the main shadow effects and their influence on blade loads and power response of the downstream turbine. For this purpose, Detached Eddy Simulations (DES) were performed using the flow solver FLOWer from DLR (German Aerospace Center). To consider all relevant aerodynamic effects, the main turbine components are represented as direct model with resolved boundary layers. Measurement-based turbulent inflow conditions are prescribed to realistically account for the atmospheric boundary layer. In order to analyze the flow conditions in front of the downstream turbine, wake propagation and velocity spectra are evaluated and compared with the undisturbed atmospheric boundary layer. Their impact on loads and power production and their corresponding fluctuations is discussed by comparing these with the upstream turbine. It was found, that fatigue loads occurring at half-wake conditions are significantly higher for the downstream turbine, since blade load fluctuations are highly amplified by the unsteady wake of the upstream turbine.