Numerical investigations of the effects of different arrays on power extractions of horizontal axis tidal current turbines
Numerical investigations of the effects of different arrays on power extractions of horizontal axis tidal current turbines
复制标题
DOI：
10.1016/j.renene.2012.10.048
复制
发表时间：
2013-05
期刊：
影响因子：
8.7
通讯作者：
Guanghui Bai;Jun Li;Pengfei Fan;Guojun Li
中科院分区：
文献类型：
--
作者：
Guanghui Bai;Jun Li;Pengfei Fan;Guojun Li
随着潮流产业的发展，潮汐能的提取受到了广泛的关注。本文将叶片单元法与三维Navier-Stokes代码相结合，建立了叶片单元作动器盘模型，分析了功率抽取与涡轮阵列布置的关系。首先，建立了孤立涡轮的数值模拟模型，并用实验数据对模型进行了验证。然后，利用该验证模型，对不同排列方式和旋转方向下的水平轴潮流水轮机功率提取进行了预测。研究结果表明，交错网阵水轮机能比直线网阵水轮机吸收更多的潮汐能，且交错网阵水轮机受上游水轮机旋转的影响较小。此外，对于交错网格阵列，讨论了功率系数与横向距离和纵向距离之间的关系。适当的横向距离约为2.5涡轮直径，而纵向距离应尽可能使用最大值。当纵向距离为涡轮直径的6倍时，相对功率系数可达3.74。为了进一步提高功率提取，本研究提出了一种改进的交错网格阵列布局。改进后的四排涡轮阵列的相对功率系数比原阵列提高了约3-4%，并且随着第二排和第三排之间距离的增加而增加。仅考虑前两排涡轮机，总功率提取可以比同等数量的孤立涡轮机高11%。
As the tidal current industry grows, power extraction from tidal sites has received widespread attention. In this paper, a blade element actuator disk model that is coupled with the blade element method and a three-dimensional Navier–Stokes code is developed to analyse the relationship between power extraction and the layout of turbine arrays. First, a numerical model is constructed to simulate an isolated turbine and the model is validated using experimental data. Then, using this validated model, the power extraction of horizontal axis tidal current turbines using different tidal turbine arrays and rotation directions is predicted. The results of this study demonstrate that staggered grid array turbines can absorb more power from tidal flows than can rectilinear grid array turbines and that staggered grid array turbines are less affected by the rotation of upstream turbines. In addition, for staggered gird arrays, the relationships between power coefficients, lateral distance and longitudinal distance are discussed. The appropriate lateral distance is approximately 2.5 turbine diameters, whereas for the longitudinal distance, the largest value possible should be used. The relative power coefficient can achieve 3.74 when the longitudinal distance is 6 times the turbine diameter. To further increase the power extraction, this study suggests an improved staggered grid array layout. The relative power coefficient of the improved four-row turbine arrays is approximately 3–4% higher than that of the original arrays and will increase as the distance between the second-row and third-row increases. Considering only the first two rows of turbines, the total power extraction can be 11% higher than for an equivalent number of isolated turbines.