Accuracy of the actuator disc-RANS approach for predicting the performance and wake of tidal turbines
Accuracy of the actuator disc-RANS approach for predicting the performance and wake of tidal turbines
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DOI：
10.1098/rsta.2012.0293
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发表时间：
2013-02
期刊：
影响因子：
--
通讯作者：
W. Batten;M. Harrison;A. Bahaj
中科院分区：
文献类型：
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作者：
W. Batten;M. Harrison;A. Bahaj
RANS模型在风能和潮汐能领域被广泛用于预测水平轴涡轮机的尾迹。该模型适用于关注涡轮机对流量的大规模影响的情况，例如，考虑环境影响或设备阵列时。潮汐流涡轮机尾流建模模型的准确性尚未得到证明，文献中类似模拟场景的流量预测差异很大。本文比较了致动器盘-RANS模型的结果，其中涡轮机力是使用叶素方法导出的，与在缩尺涡轮机尾流中测量的实验数据。它还比较了一个更简单的均匀致动器盘模型的结果。比较表明，该模型是准确的，可以预测高达94%的变化，在尾流的中心线上测量的实验速度数据，因此，证明了致动器盘RANS模型是一个精确的方法来模拟一个涡轮机尾流，和一个保守的方法来预测性能和负载。因此，它可以放心地应用于类似的场景。
The actuator disc-RANS model has widely been used in wind and tidal energy to predict the wake of a horizontal axis turbine. The model is appropriate where large-scale effects of the turbine on a flow are of interest, for example, when considering environmental impacts, or arrays of devices. The accuracy of the model for modelling the wake of tidal stream turbines has not been demonstrated, and flow predictions presented in the literature for similar modelled scenarios vary significantly. This paper compares the results of the actuator disc-RANS model, where the turbine forces have been derived using a blade-element approach, to experimental data measured in the wake of a scaled turbine. It also compares the results with those of a simpler uniform actuator disc model. The comparisons show that the model is accurate and can predict up to 94 per cent of the variation in the experimental velocity data measured on the centreline of the wake, therefore demonstrating that the actuator disc-RANS model is an accurate approach for modelling a turbine wake, and a conservative approach to predict performance and loads. It can therefore be applied to similar scenarios with confidence.