基于CFD的大型风力发电机组叶片气动性能研究

摘要

为了研究大型风力发电机组叶片的气动性能,提出了基于CFD技术的叶片气动性能分析方法.该方法采用RANS方程结合SST湍流模型,以实现对大型风机叶片二维翼型气动性能和三维气动性能的分析预报.在此基础上,采用二维方法分析了NACA64-618翼型-180°～180°攻角下的气动性能,获得了其失速攻角,与试验数据的比较证明了该方法的准确性；建立了2MW大型风机三维叶轮模型,采用三维方法分析了其气动性能,与GHBladed软件计算结果比较证明了三维方法的可行性.最后,对2MW风机翼型进行了优化,改善了其气动性能.研究方法对于大型风机叶片的设计,优化及新翼型的开发具有重要参考价值.%In order to research the aerodynamic performance of a large wind turbine blade, a new analysis method was proposed based on CFD technology for prediction of 2D blade and 3D blade aerodynamic performance. The a-nalysis combined a RANS equation and SST turbulence model. Using the 2D method, the aerodynamic performance of a NACA64 -618 wing type aerofoil was analyzed under the - 180?~ 180?angle of attack, and thereby the stall angle was obtained. The comparison with the test data shows that this method is accurate. Then a 3D impeller model of a 2MW big wind turbine was set up, and relevant aerodynamic performance was analyzed by the 3D method. By comparison with the result obtained by the GHBladed software, the feasibility of the 3D method was proven. Based on this finding, the 2MW wind turbine aerofoil was optimized, improving its aerodynamic performance. The research method has an important reference value for the design and optimization of a large wind turbine blade and the development of a new aerofoil.