Tidal turbine performance and near-wake characteristics in a sheared turbulent inflow
Tidal turbine performance and near-wake characteristics in a sheared turbulent inflow
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DOI：
10.1016/j.renene.2021.05.026
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发表时间：
2021-09
期刊：
影响因子：
8.7
通讯作者：
A. Vinod;Cong Han;A. Banerjee
中科院分区：
文献类型：
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作者：
A. Vinod;Cong Han;A. Banerjee
在高能量潮汐站点的湍流非均匀流动环境导致潮汐流涡轮机的功率性能的变化。此外，由于剪切和升高的流入湍流的组合效应导致的非均匀载荷影响器械的生存性。在目前的研究中，主动网格湍流发生器用于模拟剪切湍流流入代表洪水（低剪切）和落潮（高剪切）。将在剪切湍流入流条件下测量的涡轮机模型的性能和近尾流特性与流速均匀且湍流强度（Ti）较低和较高的条件进行比较。与lowTicase相比，剪切湍流流入导致最大功率系数下降5-15%。剪切气流的扭矩波动增加了30%，推力波动增加了50%。与均质情况下观察到的近轴对称尾流剖面不同，观察到流入剪切在近尾流中激发不对称性，对尾流湍流产生直接影响，对速度亏损和积分长度尺度产生更渐进的影响。这些数据集被认为在校准计算模型以更好地预测涡轮机响应和优化涡轮机效率以及补充动力输出系统方面是有价值的。
Turbulent non-homogenous flow environments at high-energy tidal sites lead to variation in power performance of tidal stream turbines. In addition, non-uniform loading due to combined effects of shear and elevated inflow turbulence affects device survivability. In the current study, an active-grid turbulence generator is used to mimic sheared-turbulent inflow representative of the flood (low shear) and ebb tides (high shear). The performance and near-wake characteristics of a turbine model measured in the sheared-turbulent inflow conditions are compared to conditions where the flow velocity is uniform with low and elevated turbulence intensities (Ti). The sheared-turbulent inflows were observed to result in a 5–15% drop in maximum power coefficient when compared to the lowTicase. An increase of ∼30% in torque- and ∼50% in thrust- fluctuations were observed for sheared inflows. Unlike the near axisymmetric wake profiles observed for homogeneous cases, inflow shear was observed to incite asymmetry in the near-wake with an immediate impact in wake turbulence and a more gradual effect on the velocity deficit and integral length scales. The data sets are deemed valuable in calibrating computational models to better predict turbine response and optimize turbine efficiency and the complementing power take-off system.