摘要
采用CFD方法,通过在风力机二维翼型和三维叶片表面设置等效颗粒粗糙度,对某1.5MW水平轴风力机积灰和昆虫引起的粗糙度效应进行详细的数值研究;计算结果表明:翼型表面尤其是前缘的粗糙度严重影响翼型气动性能,翼型气动性能对翼型表面光洁到粗糙的变化敏感,翼型前缘的粗糙度敏感性随着攻角增大而增加,压力面尾缘局部粗糙度会在一定程度上提高翼型气动性能;对于三维叶片,表面粗糙度尤其是叶尖部位将严重破坏叶片气动性能,叶片整体粗糙度效应不是各段局部粗糙效应简单的线性叠加,而是其综合影响的结果。该文研究可以对风力机叶片表面粗糙度效应机制和气动性能优化提供理论依据。
Equivalent sand-grain roughness was carried out with CFD method to investigate the effects of dust and insects on the performance of a 1.5MW horizontal axial wind turbine. The results indicate that surface roughness especially on the leading edge seriously decreases the aerodynamic performances of the airfoils and the roughness sensitivity increases with an increase in the angle of attack（AOA）. The roughness sensitivity of the leading edge increases with the increase in AOA as well, and the roughness located on the trailing edge of the pressure side could improve the aerodynamic performance to some extent; The roughness located on the 3D blade, especially near the tip, seriously decreases the aerodynamic performance; The total effect of the surface roughness on the blade is not a linear superposition of local effects of the surface roughness along the span of the blade, but a result of comprehensive effects. This research can provide a valuable reference for the mechanism of the effect of surface roughness and aerodynamic optimization.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第20期3384-3391,共8页
Proceedings of the CSEE
关键词
风力机
气动性能
表面粗糙度
数值模拟
粗糙度敏感性
wind turbine
aerodynamic performance
surface roughness
numerical simulation
roughness sensitivity
