基于风洞实验的风力机叶片气动负载计算方法

COMPUTATION OF AERODYNAMIC LOAD OF HORIZONTAL AXIS WIND TURBINE BLADE BASED ON WIND TUNNEL TEST

提出一种基于风洞实验的风力机叶片气动负载计算方法。理论分析Beddoes-Leishman空间状态模型的非定常气动力特性,结合风洞实验数据和Beddoes-Leishman模型开发动态气动负载的数值计算程序。利用开发程序,分别详细计算DU97W300-10翼型在不同攻角区间,即线性区、失速区和全区的非定常气动系数,分析每个区间内附着流和分离流对翼型动态气动特性的影响。结果表明,在所有攻角区域的气动参数计算结果均能很好地与理论分析结果达成一致,翼型风洞实验可有效保证特定翼型动态气动负载计算的准确性。

A computation method of unsteady aerodynamic load of horizontal axis wind turbine blade was presented based on wind tunnel test. The unsteady aerodynamic characteristics of Beddoes-Leishman space state model were analyzed theoretically ; the computation program of dynamic aerodynamic loads was developed by combining wind tunnel data with Beddoes-Leishman model. The unsteady aerodynamic coefficients of DU97W300-10 airfoil were calculated in detail in different range of angle of attack, such as linear region, stall region and full region based on the developed program. In each region, the effects of the attached flow and the separated flow on airfoil aerodynamic performance were studied. It is shown that the computation results of aerodynamic parameters in all range of angle of attack have a good agreement with the theoretical analysis result, and the accuracy of the aerodynamic load computation of special airfoils can be guaranteed by wind tunnel test.