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在额定尖速比下,结合滑移网格的大涡模拟方法,对有无叶尖S型小翼的三叶片水平轴风力机流场特性进行了数值研究,结果表明:加装S型小翼后,改善了风轮上游的速度及压力分布情况,汲取了更多的风能;风轮压力面及吸力面的最大压差由1359 Pa提高到1756 Pa,使风轮功率放大;叶尖涡结构扩展规律与PIV(Particle Image Velocimetry)实验结果一致,叶尖涡轴向速度由15.6 m/s降低到了13.3 m/s,涡漩能量减少,叶尖涡涡量强度减弱,降低了气动噪声。
Under the condition of rated tip speed, a large-eddy simulation method based on slip-grid was used to study the flow field characteristics of a three-blade horizontal axis wind turbine with tipless S-shape winglet. The results show that: After the wings, the speed and pressure distribution in the upstream of the wind wheel are improved, and more wind energy is drawn in. The maximum pressure difference between the pressure side and the suction side of the wind wheel is increased from 1359 Pa to 1756 Pa, so that the power of the wind wheel is magnified. The structure expansion law is consistent with the PIV (Particle Image Velocimetry) experimental results. The axial velocity of the tip vortex is reduced from 15.6 m / s to 13.3 m / s, the eddy energy is reduced, and the tip vortex intensity is reduced, reducing the aerodynamic noise.