Numerical validation of the two-scale actuator disc theory for marine turbine arrays
Numerical validation of the two-scale actuator disc theory for marine turbine arrays
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发表时间：
2015-09
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通讯作者：
Edgar Perez-Campos;T. Nishino
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作者：
Edgar Perez-Campos;T. Nishino
潮汐和海洋涡轮发电场的水动力建模面临的挑战是考虑各种尺度上流动事件的相互作用，例如叶片尺度、涡轮尺度、阵列尺度和区域尺度。虽然可以使用经典的叶片单元动量 (BEM) 理论来研究叶片和涡轮尺度的相互作用，但直到最近还没有可用的基本理论来描述涡轮和更大尺度的相互作用。两尺度致动器盘理论（ADT）由 Nishino 和 Willden 于 2012 年首次提出，从根本上解释了涡轮机和阵列尺度的相互作用；然而，其有效性或对实际问题的适用性仅得到部分证实。因此，在本研究中，我们对具有垂直剪切流的浅明渠中间的单排和双排多孔盘（每排 8 个盘）进行 3D RANS 模拟。仿真结果与双尺度 ADT 定性一致，重要的是，对于单排和双排情况，仿真预测的最佳盘内间距（以最大化总功率）与理论非常吻合。关键词：潮汐流能、海流能、多尺度建模、流体动力学、最佳涡轮机阵列
The challenge in the hydrodynamic modelling of tidal and marine turbine farms is to take into account the interaction of flow events across a wide range of scales, such as the blade scale, turbine scale, array scale and regional scale. Whilst the interaction of the blade and turbine scales can be studied using the classical Blade-Element-Momentum (BEM) theory, no basic theory was available until recently to describe the interaction of the turbine and larger scales. The two-scale actuator disc theory (ADT), first proposed in 2012 by Nishino and Willden, explains the interaction of the turbine and array scales at a fundamental level; however, its validity or applicability to real problems has only partially been confirmed. Hence in this study we perform 3D RANS simulations of single and double rows of porous discs (8 discs for each row) in the middle of a shallow open channel with a vertically sheared flow. The simulation results are shown to agree qualitatively with the two-scale ADT and importantly, the optimal intra-disc spacing predicted by the simulations (to maximise the total power) agrees well with the theory, for both singleand double-row cases. Keywords—Tidal stream energy, Ocean current energy, Multiscale modelling, Hydrodynamics, Optimal turbine array