Towards reduced order modelling for predicting the dynamics of coherent vorticity structures within wind turbine wakes
Towards reduced order modelling for predicting the dynamics of coherent vorticity structures within wind turbine wakes
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DOI：
10.1098/rsta.2016.0108
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发表时间：
2017-04
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影响因子：
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通讯作者：
M. Debnath;C. Santoni;S. Leonardi;G. Iungo
中科院分区：
文献类型：
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作者：
M. Debnath;C. Santoni;S. Leonardi;G. Iungo
大气边界层与风力机阵列相互作用产生的速度场动力学特性对风电场的性能和风力机的耐久性有重要影响。在这项工作中，风力机尾迹的动力学和螺旋面尖涡的不稳定性通过模态分解技术进行了检测和表征。所研究的数据集由孤立风力机的大涡模拟(LES)获得的速度场快照组成，其中风力机叶片对大气边界层施加的气动强迫通过激励器线模型来模拟。重点研究了螺旋形叶尖涡的下游演化与透平塔面交替脱落涡之间的相互作用。通过不同的模式分解技术，如本征正交分解和动态模式分解，对大涡模拟数据集进行了查询。选择主要的尾迹动力学建立降阶模型，该模型包括一种线性时间推进算法，其中流动动力学的时间演化由先前的时间实现乘以时间不变算子得到。本文是《复杂地形中的风能》专题的一部分。
The dynamics of the velocity field resulting from the interaction between the atmospheric boundary layer and a wind turbine array can affect significantly the performance of a wind power plant and the durability of wind turbines. In this work, dynamics in wind turbine wakes and instabilities of helicoidal tip vortices are detected and characterized through modal decomposition techniques. The dataset under examination consists of snapshots of the velocity field obtained from large-eddy simulations (LES) of an isolated wind turbine, for which aerodynamic forcing exerted by the turbine blades on the atmospheric boundary layer is mimicked through the actuator line model. Particular attention is paid to the interaction between the downstream evolution of the helicoidal tip vortices and the alternate vortex shedding from the turbine tower. The LES dataset is interrogated through different modal decomposition techniques, such as proper orthogonal decomposition and dynamic mode decomposition. The dominant wake dynamics are selected for the formulation of a reduced order model, which consists in a linear time-marching algorithm where temporal evolution of flow dynamics is obtained from the previous temporal realization multiplied by a time-invariant operator. This article is part of the themed issue ‘Wind energy in complex terrains’.