Towards a better understanding of yawed turbine wake for efficient wake steering in tidal arrays
Towards a better understanding of yawed turbine wake for efficient wake steering in tidal arrays
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DOI：
10.1016/j.renene.2021.05.152
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发表时间：
2021
期刊：
影响因子：
8.7
通讯作者：
P. Modali;A. Vinod;A. Banerjee
中科院分区：
文献类型：
--
作者：
P. Modali;A. Vinod;A. Banerjee
潮汐流涡轮机（TST）部署在开放水域的能源网站，往往是无意中在偏航来流，导致性能下降和偏转的尾流。尾流转向是风力阵列中的一个流行概念，其中上游涡轮机有意地在偏航时操作，以使尾流远离下游涡轮机。为了探索TST阵列的这种布置，进行了协同实验和数值活动，以表征TST性能和±15°偏航入流的尾流偏转。近尾流特性的研究进行了补充声学多普勒测速测量和三维计算流体动力学。实验表明，最大功率系数降低了约10%。在近场，由于形成两个反向旋转的涡，偏转尾流变形为椭圆形。尾流偏转导致增强的动量传递和耗散，从而加速能量回收。当上游涡轮机偏航时，下游涡轮机的流中的可用动能在涡轮机阵列处于交错配置的情况下比直列配置高至少50%。我们的结果为减少阵列中涡轮机单元之间的横流和下游间距提供了指导。
Tidal stream turbines (TST) deployed in open-water energetic sites are often unintentionally at yaw to the incoming flow that causes performance degradation and deflection of the wake. Wake steering is a popular concept in wind arrays where the upstream turbine is operated intentionally at yaw to steer the wake away from a downstream turbine. To explore such arrangements for TST arrays, a synergistic experimental and numerical campaign was undertaken to characterize a TST performance and wake deflection subjected to ±15° yawed inflow. The near-wake characterization study was performed using complementary acoustic Doppler velocimetry measurements and 3D computational fluid dynamics. The experiments show a ∼10% reduction in the maximum power coefficient. In the near field, the deflected wake morphed into an elliptical shape due to the formation of two counter-rotating vortices. The wake deflection results in enhanced momentum transfer and dissipation, leading to accelerated energy recovery. When the upstream turbine is yawed, available kinetic energy in the flow for the downstream turbine is at least 50% higher with the turbine array in a staggered configuration compared to the inline configuration. Our results provide guidance in reducing the cross-stream and downstream spacing between turbine units in an array.