基于预定涡尾迹法的风力机性能研究

以三叶片水平轴风力机为研究对象,建立了尾迹扩张模型,研究了叶片尾迹流动结构。涡面模型叶片无量纲环量的计算结果与经典环量数据对比,结果吻合较好。计算了根尖涡模型风轮面诱导速度随尾迹扩张系数的变化关系,得出了尖速比对气动性能的影响:推力系数与环量及尖速比成正比;对于不同环量,功率系数存在最佳尖速比。分析了尾迹扩张模型对气动性能的影响:推力系数和功率系数与尾迹扩张系数成正比,尾迹收敛参数对其影响甚微。

Aeroerformance analysis of wind turbine based on prescribed vortex wake method

Tip-Root and vortex sheet configuration of prescribed vortex wake model were used to predict the aeroperfor -mance based on lifting line theory.For three blade horizontal axis wind turbine , the wake structure was constructed by introducing a wake expansion model .Reproduced non-dimensional circulation along the blade of vortex sheet configura -tion agrees well with the classical Goldstein Function .The calculated results of Tip-Root configuration showed the regu-larity of rotor plane induced velocity changing as wake expansion ratio varied .It’s demonstrated that thrust coefficient was proportional to circulation and tip speed ratio , and optimal power coefficient comes with the best tip speed ratio for different circulation.Thrust coefficient and power coefficient was proportional to wake expansion rate , while wake con-vergence parameter had little impact .