扰流板对风电机组叶片三维气动性能影响的研究

STUDY ON INFLUENCE OF SPOILER ON THE 3D AERODYNAMIC PERFORMANCE OF WIND TURBINE BLADES

对于风电机组叶片,由于大型叶片根部翼型较厚,易出现流动分离现象,为了提高叶片气动性能,利用雷诺平均方程(RANS),采用SST k-ω湍流模型进行了叶片三维气动性能的仿真模拟,并与Bladed软件的计算值进行对比,验证了该方法的可行性。仿真模拟结果显示:叶片根部压力面和吸力面压力曲线交叉,严重影响了叶片轴端的输出功率,而安装扰流板的叶片根部压力面流体速度呈梯度下降,压力增大,同时提高了吸力面的流速,从而增大了叶片两面的压力差。在低于额定风速条件下,扰流板可以提高叶片轴端的输出功率2.3%~2.5%,推力增长仅为2.0%;扰流板安装高度越高,其轴端输出功率提升效果越好。

For wind turbine blades,due to the thick airfoil at the root of the large blade,flow separation is easy to occur.In order to improve the aerodynamic performance of the blade,this paper uses the Reynolds average equation(RANS)and the SST k-ωturbulence model to simulate the 3D aerodynamic performance of the blade.Comparing with the calculated value of Bladed software,the feasibility of the method is verified.The simulation results show that the pressure curves of the blade root pressure surface and the suction surface intersect,which seriously affects the output power of the blade shaft end.After the spoiler is installed,the pressure surface flow velocity of the blade root decreases gradually,and the pressure increases.At the same time,the spoiler improves the flow velocity on the suction surface and increases the pressure difference between the two sides of the blade.Under the condition of lower than rated wind speed,the spoiler can increase the output power of the blade shaft end by 2.3%~2.5%,and the thrust increase is only 2.0%.The higher the installation height of spoiler,the better the shaft end output power boost.