水平轴风力机多涡格升力面涡尾迹法的研究

摘要

In this study, we used a free vortex wake method based on a multi⁃lattice lifting surface to simulate aerodynamic performance at low and high wind speeds of the NREL Phase VI experimental two⁃blade horizontal axis wind turbine. To ad⁃dress the trailing edge separation lag caused by stall delay at high wind speeds, we coupled the Kirchhoff⁃Helmholz trailing edge separation prediction model and the Du⁃Selig 3D static stall delay model. We then calculated the aerodynamic perform⁃ance at both low and high wind speeds for different yaw angle conditions. We also discuss the influence of different vortex lattice numbers on calculation accuracy. Our simulation results demonstrate that, at low wind speeds, the vortex lattice num⁃ber has little influence, while it has great impact at high wind speeds. We obtained the best simulation results of the normal force and tangent force coefficients for the set of two vortex lattices on the lifting surface.%针对NREL Phase VI实验双叶片水平轴风力机，采用基于多涡格升力面的自由尾迹法模拟其低风速及高风速气动性能。由于高风速失速延迟导致尾缘分离滞后，建立Kirchhoff－Helmholz尾缘分离预估模型与Du－Selig失速延迟模型耦合的三维尾缘分离预估模型。计算低风速及高风速不同的偏航角工况，对比分析不同涡格数对模拟结果的影响。研究结果表明：涡格数对低风速工况影响甚小，对高风速影响很大，且采用两涡格的三维尾缘分离预估模型对法向力系数和弦向力系数的模拟最为精确。