【摘要】 大尺度风轮在自然条件下叶片周围流场复杂,对于气动性能影响很大,采用主流方法BEM理论在失速偏航时计算误差较大。为解决上述问题,采用CFD软件提供的方法计算不同风速、叶轮转速以及桨距角对于流场绕流的影响,在计算功率与设计功率很好符合的基础上,详细分析桨叶附面层流动分离现象,并比较了不同攻角下翼型绕流对叶片载荷影响。结果提出优化方案:不超过运行风速时,流动分离仅发生在根部附近,叶片表面具有良好的绕流特性;超过运行风速时,可通过变桨调节避免失速,降低叶片载荷强度。计算结果能够为掌握风力机的能量吸收规律、提高叶片气动性能提供支持。更多还原

【Abstract】 In the paper,a numerical simulation method was adopted for the flow numerical simulation of wind turbine blades aerodynamic performance.Based on the well predicated powers compared with the designed data,the flow separation of boundary layer was analysed and the blade loading caused by flow around airfoils under different attack angle was compared.The results show that when the speed is slower than normal wind velocity,flow separation occurs on blade root only,and the blade surface has shown a good two-dimension flow;when beyond the normal wind velocity,it can reduce blade load strength by the variable propeller adjustment.It can improve wind turbine performance and give support to master law of wind turbine’s energy absorption.更多还原