A one-dimensional model for tidal array design based on three-scale dynamics
A one-dimensional model for tidal array design based on three-scale dynamics
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DOI：
10.1017/jfm.2017.399
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发表时间：
2017-08-25
影响因子：
3.7
通讯作者：
Young, Anna M.
中科院分区：
文献类型：
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作者：
Gupta, Vikrant;Young, Anna M.
为了使潮汐能的提取在经济上可行，必须在每个潮汐阵列中优化每个涡轮机的发电量。此外，必须了解电力提取对海洋流动环境的影响。这两个目标意味着设计师必须能够模拟潮汐阵列的不同配置，以创建最有效，最小侵入性的布置。在本文中，一个分析模型开发的阵列设计在理想的矩形潮汐通道与理想的涡轮机。该模型包括（i）局部阻塞，（ii）表面变形和（iii）由于安装阵列而增加的阻力的影响。虽然在过去的工作中，这些影响已被单独考虑，但这里提出的模型是第一个包括所有三个，以便可以理解不同影响之间的相互作用。最佳的局部堵塞和涡轮机阻力的结果，作为固有的通道阻力系数，通道长度和弗劳德数在各种全球堵塞值的函数。它将被证明，它是必要的，以获得潮汐阵列的设计参数（全球堵塞，局部堵塞和涡轮机阻力），这将最大限度地提高每个涡轮机的功率提取模型的影响，同时增加阻力。忽略任何一种影响都将导致阵列设计的功率提取低于最佳值，增加不必要的额外涡轮机和阵列的功率损失更高。
In order to make the extraction of tidal current energy economically viable, the power production per turbine must be optimised in each tidal array. Furthermore, the impact of power extraction on the marine flow environment must be understood. These two aims mean that designers must be able to model different configurations of a tidal array in order to create the most efficient, least invasive arrangement. In this paper, an analytical model is developed for array design in idealised rectangular tidal channels with idealised turbines. The model includes the effects of (i) local blockage, (ii) surface deformation and (iii) added drag due to the installation of the array. While these effects have been accounted for individually in past work, the model presented here is the first to include all three such that the interaction between different effects can be understood. Results are presented for optimal local blockage and turbine resistance as functions of inherent channel drag coefficient, channel length and Froude number at various global blockage values. It will be shown that it is necessary to model the effects of local blockage and added drag simultaneously in order to obtain the design parameters of a tidal array (global blockage, local blockage and turbine resistance), which will maximise the power extraction per turbine. Neglecting either effect will lead to an array design with lower power extraction than the optimum, the addition of unnecessary extra turbines and higher lost power from the array.