风力机三维尾流模型研究与验证

RESEARCH AND VALIDATION OF 3D WAKE MODEL FOR WIND TURBINE

考虑风剪切效应,提出一种高斯形状的三维尾流模型(3DG-k)。该模型定义尾流半径rw等于两倍的高斯特征参数σ,并与物理尾流边界的扩展系数k建立联系,来描述风轮后尾流边界的演变规律。通过GH风洞实验数据、Nibe风电场实测数据、Vestas V80-2 MW风力机大涡模拟数据,对3DG-k模型、Jensen模型、三维高斯模型(3DG)及三维椭圆高斯模型(3DEG)进行对比分析。研究结果显示,3DG-k模型在3种案例中均显示出最佳的预测精度,更适用于工程实际应用。

A Gaussian shape three-dimensional wake model(3DG-k)is proposed considering the wind shear effect.The model defines the wake radius rwequal to twice the Gaussian characteristic parameter σ and establishes a link with the expansion coefficient k of the physical wake boundary to describe the evolution law of the wake boundary after the wind turbine.The 3DG-k model,Jensen model,three-dimensional Gaussian model(3DG)and three-dimensional elliptical Gaussian model(3DEG)are compared and analyzed by GH wind tunnel experiment data,actual measurement data from Nibe wind farm and large eddy simulation data from Vestas V80-2 MW wind turbine.The results show that the 3DG-k model shows the best prediction accuracy in all three cases and is more suitable for practical engineering applications.