风力机翼型及叶片气动性能数值模拟

Numerical simulation of aerodynamic performance of wind turbine aerofoil and blade

采用FLUENT数值计算方法模拟了NACA4412、NACA4418、FX60-126和NREL-S809四种常用风力机翼型和单位长度平板叶片以及单位长度实际叶片.通过数值计算所得4种翼型的升阻力系数曲线与实验数据的对比,验证了计算模型和计算方法的准确性,在此基础上分析了翼型和平板叶片随攻角变化的流场分布规律以及实际叶片的三维气动特性,数值模拟结果显示三维平板叶片在失速攻角附近气流展向流动较明显,三维实际叶片旋转时气流展向流动产生了三维涡体,更准确地反映了实际叶片的气动特性.

Four commonly used wind turbine aerofoils,which are NACA4412,NACA4418,FX60-126 and NREL-S809,and unit length flat blade and factual blade were numerically simulated by FLUENT.The lift coefficient and drag coefficient curves of the four aerofoils were calculated and compared with the experimental results,which validated the accuracy of the calculation model and method.The flow field distribution rules of aerofoils and flat blade at different angles of attack and 3D aerodynamic performance of factual blade were analyzed.The results of numerical simulation show that the airflow along the radial direction of 3D flat blade is obvious at the stallout angle of attack;and the 3D votices are produced by the airflow along the radial direction when the blade rotated,which reflect the aerodynamic performance of actual blade more precisely.