钝尾缘叶片具有良好的结构与气动特性，其尾缘厚度的增加导致边界层压力梯度变化，尾迹增厚脱落成涡街，非定常因素增加，气动参数偏离与波动等问题产生。为解决叶片设计中的以上问题，提出了依据三维非定常流动机理建立新三维修正模型并考虑气动参数波动的气动分析方法。主要研究：①柯氏力对三维流动的影响；②尾缘涡街导致的非定常气动载荷变化；③钝尾缘翼型三维修正。拟首先针对该类叶片研究数值求解方法；其次，采用基于中型机组的实验平台，测量叶片典型截面的气动参数，验证并改进数值方法；最后，模拟旋转运动中叶片的三维流场结构，边界层特征（速度型、动量厚度、转捩、分离等），尾涡演化等。拟达目标为：揭示三维流动机理，尾涡与三维边界层的相互影响，尾涡在叶片非定常气动载荷中的作用；改进钝尾缘翼型气动参数的三维修正模型；并据此建立专门针对钝尾缘叶片的非定常气动分析方法。结果对设计低载、轻质、高效大型风电叶片提供方法及理论基础。

Wind turbine blades with blunt trailing edges are advantageous to improve both structural and aerodynamic characteristics. However, there are problems due to the blunted trailing edges. The adverse pressure gradient in boundary layer and aerodynamic performance are changed by thick trailing edge; and, the thick wakes will evolve to Karman eddies in near wake region which leads to fluctuation of aerodynamic loads. They are great challenges to design this kind of blades. Therefore, an aerodynamic analysis method is put forward including a new 3D correction model and consideration of undulate aerodynamic parameters. The investigations are focused on 1) the influence on 3D flow by Coriolis force, 2) unsteady aerodynamic loads due to eddies shedding in the wake, 3) rotational correction model of blunt airfoils. The research will be carried out in steps as follows. At first, a numerical method dedicated to this kind of blades should be developed. Secondly, the performance of blade and aerodynamic parameters at representative locations will be measured at a medium-sized wind turbine. The CFD method is going to be verified by the experiment results. After finishing those two steps above, the flow field structure will be simulated, as well as boundary layer (including velocity profile, momentum thickness, transition, separation etc.) and the evolution of wake vortex street. The results are aimed to reveal the mechanism of 3D flow on blunt blades, interference of wake eddies and boundary layer, influence on unsteady loads due to shedding vortices. Furthermore, a unsteady aerodynamic analysis method is then developed by improving 3D correction model of blunt airfoils and adding the waved aerodynamic parameters of these airfoils. This investigation will contribute to improve the basic theories and design methods of large wind turbine blades with lower loads, weights and higher efficiency.