扰动入流对风力机叶片流场及输出功率的影响分析

Analysis of the influence of the disturbance flow on the flow field and the output power of the wind turbine blade

基于漩涡法与实验条件修正入流条件,结合延迟分离涡湍流模型,对水平轴风力机气动特性进行数值模拟。分析风力机压力系数、截面涡量和功率特性,并与均匀入流和实验数据对比。研究表明,修正的扰动入流对风力机叶片叶根处截面压力系数的影响比均匀入流更大,但随翼展方向趋于一致;扰动致使在叶片0.57~0.71 R处产生更大的涡量损失,小于额定尖速比时输出功率更接近实验值。基于漩涡法的风力机气动特性模拟方案,可更有效地应用于风力发电预测研究。

The aerodynamic characteristics of a horizontal axis wind turbine were calculated by numerical simulation based on the vortex method and the experimental correction conditions and combined with the delayed separation vortex turbulence model. The wind turbine pressure coefficient, the cross section of the vortex and the power characteristics of the wind turbine in the disturbances inflow condition were analyzed and compared with these parameters in the uniform inflow and there experimental data in this paper. The results indicated that the influence of the corrected disturbances inflow on the section pressure coefficient of the wind turbine blade root was higher than that of the uniform inlet flow, however this phenomenon tended to be consistent along with the spanwise direction. The disturbance resulted in the greater loss of the vorticity at the blade 0.57 R to 0.71 R, and the output power was similar to the experimental values when the tip speed ratio was less than the rating value. At last, the wind turbine aerodynamic performance simulation scheme based on the vortex method obtained more effectively application on wind power generation prediction research.