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通过PIV实验研究和非定常CFD数值计算相结合的办法,对风力机二维翼型(NREL S809)的流动参数和流场结构开展研究。利用PIV系统对在一定的雷诺数、不同攻角下翼型的流场进行测量,获得了丰富的流场信息;同时采用CFD软件对相应的流场进行了数值模拟,实验值与计算值吻合很好。该文着重比较了在不同攻角下实验和计算所获得的速度矢量图以及升力和阻力等气动参数,并结合实验数据分析了不同攻角下涡的分布及附面层的分离现象。
The flow parameters and flow field structure of wind turbine two-dimensional airfoil (NREL S809) were studied through a combination of PIV experimental and unsteady CFD numerical calculation. The PIV system was used to measure the flow field of the airfoil under a certain Reynolds number and different angles of attack, and abundant flow field information was obtained. At the same time, the CFD software was used to simulate the corresponding flow field, and the experimental and calculated values were in good agreement well. In this paper, we compare the velocity vectors obtained from experiments and calculations under different angles of attack with the aerodynamic parameters such as lift and drag. Combining the experimental data, we analyze the distribution of vortices and the separation of surface layers under different angles of attack.