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基于Beddoes-Leishman(B-L)半经验动态失速模型,从附着流、分离流和动态涡三个方面阐述了风力机翼型在动态失速情况下非定常气动力系数的计算方法。在此基础上根据风力机翼型工作时的实际特点对原B-L模型中分离流和动态涡气动力系数的计算进行了改进,并将模型扩充到适用于全范围攻角的动态失速计算。利用所编制的程序仿真了风力机翼型S809和NACA4415动态失速下的升力、阻力和力矩系数。计算结果与实验数据吻合良好。改进模型与原B-L模型计算结果的对比表明,改进后的模型提高了对非定常气动力系数计算的精确性和适用区间,能更好地预测动态失速气动力的变化。
Based on the Beddoes-Leishman (B-L) semi-empirical dynamic stalling model, the calculation method of unsteady aerodynamic coefficients of wind turbine airfoils under dynamic stall condition is described from three aspects: attachment flow, separation flow and dynamic vortex. On this basis, the calculation of the separation flow and dynamic vortex gas dynamic coefficient in the original B-L model is improved according to the actual characteristics of the working wind turbine at the time of operation, and the model is expanded to the dynamic calculation of stall suitable for the full range of angle of attack. The programmed procedure was used to simulate the lift, drag and moment coefficients of the dynamic airfoil S809 and NACA4415 under dynamic stall. The calculated results are in good agreement with the experimental data. The comparison between the improved model and the original B-L model shows that the improved model can improve the accuracy and the applicable range of the unsteady aerodynamic coefficient, and can better predict the aerodynamic changes of the dynamic stall.