基于Park-Gauss模型的风场尾流数值模拟

WAKE NUMERICAL SIMULATION OF WIND FARM BASED ON THE PARK-GAUSS MODEL

基于Park模型尾流区线性膨胀假设和径向风速呈高斯分布假设,提出一种新型工程尾流模型Park-Gauss模型,对单台风力机尾流场进行数值模拟研究。采用两种初始尾流半径(风轮半径和紧靠风轮下游处的尾流半径),分别对Park模型、2D Jensen模型以及Park-Gauss模型进行对比研究。经过与风场实测数据和风洞试验的比较,结果表明:以紧靠风轮下游处的尾流半径作为初始尾流半径会明显提高尾流场的预测精度;新提出的ParkGauss模型计算精度优于2D Jensen模型和Park模型;Park-Gauss模型可很好模拟尾流区的风速,不仅在精度上与试验结果接近,而且在径向分布上也更符合真实流场。

Based on the assumption of Park model that the wake region is in linear expansion and that the cross-windis in Gauss distribution, this paper proposes a new wake model, the Park-Gauss model, to conduct a research on wake numerical simulation for a single wind turbine. What is more, two kinds of initial wake radius （the radius of wind wheel and the wake radius right near downstream of the wind wheel） has been used to conduct a comparative study on the Park model, the 2D Jensen model and the Park-Gauss model respectively. By comparison with the measured wind data and wind tunnel tests, it turned out that the wake radius right near downstream of the wind wheel will significantly improve the prediction accuracy of wake field, as the initial wake radius ; calculation accuracy of the newly proposed Park-Gauss model is superior to that of 2D Jensen model and Park model ; the Park-Gauss model can simulate well the wind velocity in wake region, not only in accuracy which is nearly identical with the experimental results, but also in the cross-wind distribution which is more in line with the real flow field.