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Three-dimensional effects on the performance of a vertical axis tidal turbine

机译：立式潮汐涡轮机性能的三维影响

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摘要

In this paper, 3-D effects on the performance of the Hunter turbine have been investigated by means of numerical simulations. It was observed that there is always a performance gap between results from 2-D and 3-D models. However, with increasing aspect ratio, the uniformity of the turbine performance along the entire span was effectively improved. Moreover, at higher flow coefficients, the pressure distributions of all turbines had similar profiles. A correction factor is defined that is related to the turbine height as well as the diameter. With the aid of this definition, the performance results for all Hunter turbines equipped with six blades could be collapsed into a single relationship with flow coefficient. It was also found that the overall level of torque fluctuation in the 2-D model is far less than those in 3-D models, while the 3-D torque fluctuation decreases with increasing aspect ratio.
机译：在本文中，已通过数值模拟研究了3-D对Hunter涡轮性能的影响。据观察，在2-D模型和3-D模型的结果之间始终存在性能差距。但是，随着纵横比的增加，涡轮机性能在整个跨度上的均匀性得到了有效改善。而且，在较高的流量系数下，所有涡轮的压力分布具有相似的分布。定义了与涡轮高度以及直径相关的校正系数。借助此定义，所有配备有六个叶片的Hunter涡轮机的性能结果都可以被压缩为与流量系数的单一关系。还发现2-D模型中的扭矩波动的总体水平远小于3-D模型中的扭矩波动的总水平，而3-D扭矩波动则随着纵横比的增加而减小。

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