基于BEDDOES-LEISHMAN动态失速模型的水平轴风力机动态气动载荷计算方法

TRANSIENT AERODYNAMIC LOAD PREDICTION OF HORIZONTAL AXIS WIND TURBINE BASED ON THE BEDDOES-LEISHMAN MODEL

从对附着流和分离流的建模两方面阐述了 Beddoes-Leishman 动态失速模型。基于 Beddoes-Leishman 模型开发了动态失速数值计算程序,并将其集成到了现有的风力机气动载荷分析软件中。利用所开发的程序,计算了NACA 63-418翼型的动态失速特性,分析了平均攻角、衰减频率和马赫数的变化对动态失速特性的影响。仿真了一台1.5MW 变速恒频风电机组的发电工况,结果表明,动态失速对风力机的动态气动载荷有极大影响,在进行动态载荷仿真时必须予以充分考虑。

Accurate modeling of the dynamic stall phenomena is very important for transient aerodynamic load prediction of wind turbines. The Beddoes-Leishman dynamic stall model was presented through modeling the effects of attached flow and separated flow in the paper. Based on the Beddoes-Leishman model, a program for dynamic stall analysis was developed and integrated into the existing wind turbine aerodynamic load prediction software. Applying the developed program, the dynamic stall characteristics of NACA 63-418 airfoil were calculated. And the effects of changing mean angle, reduced frequency, and Math number were studied. The power generation load case of a 1.5MW variable speed pitch-regulated wind turbine was simulated. The result indicates that dynamic stall possesses significant influence on the transient aerodynamic load.