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Numerical simulation of a wind turbine airfoil:dynamic stall and comparison with experiments

机译:风力机翼型的数值模拟:动态失速及与实验的比较

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摘要

Unsteady aerodynamic characteristics of the National Renewable Energy Laboratory S809 airfoil, undergoing sinusoidal pitch oscillations at various reduced frequencies, mean angles of attack, and pitch oscillation amplitudes at Re = 10~6, are investigated through solutions of two-dimensional Navier-Stokes equations. It is found that there is an encouraging agreement between the computational fluid dynamics (CFD)-predicted aerodynamic force coefficient hysteresis loops and the Ohio State University wind tunnel experimental data, although discrepancies still exist at higher angles of attack and during downstroke pitch motion. The effects of some parameters are studied, and the flow behaviour and dynamic stall vortex development of a typical case are represented in great detail by streamline distribution and pressure coefficient plots. CFD methodology is proved to be promising in predicting airfoil dynamic stall characteristics, and the impact of dynamic stall on the practical operation of wind turbines is analysed. It is necessary to take this into consideration in the prediction of wind turbine performance.
机译:通过二维Navier-Stokes方程的求解,研究了国家可再生能源实验室S809机翼的非定常空气动力学特性,该机翼在各种降低的频率,正攻角和Re = 10〜6时的俯仰振荡幅度下均发生正弦俯仰振荡。发现在计算流体动力学(CFD)预测的空气动力系数滞后回线与俄亥俄州立大学风洞实验数据之间达成了令人鼓舞的共识,尽管在较高的迎角和下冲程俯仰运动期间仍存在差异。研究了一些参数的影响,并通过流线分布和压力系数图详细描述了典型情况下的流动行为和动态失速涡发展。事实证明,CFD方法在预测翼型动态失速特性方面很有前途,并分析了动态失速对风力涡轮机实际运行的影响。在预测风机性能时必须考虑到这一点。

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