Wind turbine wakes negatively affect downwind turbines in wind farms reducing their global efficiency. The reduction of wake‐turbine interactions by actuating control on yaw angles and induction factors is an active area of research. In this study, the capability of spanwise‐periodic rows of wind turbines with tilted rotors to reduce negative wake‐turbine interactions is investigated through large‐eddy simulations. It is shown that, by means of rotor tilt, it is possible to replace turbine far wakes with high‐speed streaks where the streamwise velocity exceeds the freestream velocity at hub height. Considering three aligned rows of wind turbines, it is found that the global power extracted from the wind can be increased by tilting rotors of the upwind turbine rows, similarly to what is already known for the case of a single column of aligned turbines. It is further shown that global tilt‐induced power gains can be significantly increased by operating the tilted turbines at higher induction rates. Power gains are further increased for higher ratios of rotor diameters and turbine spacings to the boundary layer height. All these findings are consistent with those of previous studies where streamwise streaks were artificially forced by means of spanwise‐periodic rows of wall‐mounted roughness elements in order to control canonical boundary layers for drag‐reduction applications.

中文翻译：

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用条纹替换风轮机阵列中的尾流

风力涡轮机的尾流会对风电场中的顺风涡轮机产生负面影响，从而降低其全球效率。通过控制偏航角和感应因子来减少尾流与涡轮的相互作用是一个活跃的研究领域。在本研究中，通过大涡模拟研究了具有倾斜转子的风轮机的翼展方向周期性排减少负尾流与涡轮相互作用的能力。结果表明，通过转子倾斜，可以用高速条纹代替透平远流，该高速条纹中的水流速度超过了轮毂高度处的自由流速度。考虑到三排排在一起的风力涡轮机，发现从风中提取的总功率可以通过倾斜逆风涡轮机排的转子来增加，与单列对准式涡轮机的情况类似。进一步表明，通过以较高的感应率运行倾斜的涡轮机，可以显着增加总体倾斜引起的功率增益。对于更高的转子直径和涡轮间距与边界层高度之比，功率增益会进一步提高。所有这些发现与以前的研究相一致，在先前的研究中，通过在壁挂式粗糙度单元的展向周期行中人为地强迫流向条纹，以控制规范的边界层来进行减阻应用。对于更高的转子直径和涡轮间距与边界层高度之比，功率增益会进一步提高。所有这些发现与以前的研究相一致，在先前的研究中，通过在壁挂式粗糙度单元的展向周期行中人为地强迫流向条纹，以控制规范的边界层来进行减阻应用。对于更高的转子直径和涡轮间距与边界层高度之比，功率增益会进一步提高。所有这些发现与以前的研究相一致，在先前的研究中，通过在壁挂式粗糙度单元的展向周期行中人为地强迫流向条纹，以控制规范的边界层来进行减阻应用。